UMUI_SKIN skin_name
Use a skin. It contain a lot of define Interface Settings. You can change a setting to redefining it.
Default: none

Example of the "blue" skin

!insertmacro MUI_DEFAULT MUI_TEXT_COLOR FFFFFF
!insertmacro MUI_DEFAULT MUI_BGCOLOR 3d66ab
!insertmacro MUI_DEFAULT UMUI_TEXT_LIGHTCOLOR FFFF00
!insertmacro MUI_DEFAULT UMUI_BRANDINGTEXTFRONTCOLOR 8b8ca4
!insertmacro MUI_DEFAULT UMUI_BRANDINGTEXTBACKCOLOR eeeef3
!insertmacro MUI_DEFAULT UMUI_LEFTIMAGE_BMP \
    "${NSISDIR}\Contrib\UltraModernUI\Skins\blue\LeftBranding.bmp"
!insertmacro MUI_DEFAULT UMUI_HEADERIMAGE_BMP \
    "${NSISDIR}\Contrib\UltraModernUI\Skins\blue\Header.bmp"
!insertmacro MUI_DEFAULT UMUI_BOTTOMIMAGE_BMP \
    "${NSISDIR}\Contrib\UltraModernUI\Skins\blue\BtmImg.bmp"
!insertmacro MUI_DEFAULT MUI_ICON \
    "${NSISDIR}\Contrib\Graphics\UltraModernUI\Icon.ico"
!insertmacro MUI_DEFAULT MUI_UNICON \
    "${NSISDIR}\Contrib\Graphics\UltraModernUI\UnIcon.ico"

UMUI_USE_BG bgskin_name
Use a background skin. It contain two macro named "UMUI_BG" and "UMUI_BG_Destroy".
Default: none

UMUI_USE_CUSTOMBG
Use a custom background skin. don't forget to create two macro named "UMUI_BG" and "UMUI_BG_Destroy".
Default: none

Example of a custom background skin:

!define UMUI_USE_CUSTOMBG

!macro UMUI_BG
  SetOutPath "$PLUGINSDIR"
  File "${NSISDIR}\Contrib\UltraModernUI\BGSkins\wxp\SpotlightBG.bmp"
  File "${NSISDIR}\Contrib\UltraModernUI\BGSkins\wxp\KeyBG.bmp"
  File "${NSISDIR}\Contrib\UltraModernUI\BGSkins\wxp\HeaderBG.bmp"
  File "${NSISDIR}\Contrib\UltraModernUI\BGSkins\wxp\BtmImgBG.bmp"
  BgImage::SetBg /NOUNLOAD /GRADIENT 78 111 214 78 111 214
  BgImage::AddImage /NOUNLOAD "$PLUGINSDIR\HeaderBG.bmp" 0 0
  BgImage::AddImage /NOUNLOAD "$PLUGINSDIR\SpotlightBG.bmp" 0 57
  BgImage::AddImage /NOUNLOAD "$PLUGINSDIR\BtmImgBG.bmp" 0 -70
  BgImage::AddImage /NOUNLOAD "$PLUGINSDIR\KeyBG.bmp" -248 -351
  CreateFont $1 "Verdana" 30 700
  BgImage::AddText /NOUNLOAD "$(^Name)" $1 8 51 155 15 70 -1 -1
  BgImage::AddText /NOUNLOAD "$(^Name)" $1 255 255 255 10 65 -1 -1
  BgImage::Redraw /NOUNLOAD
!macroend

!macro UMUI_BG_Destroy
  BgImage::Destroy
!macroend

MUI_ICON icon_file
The icon for the installer.
Default: ${NSISDIR}\Contrib\Graphics\UltraModernUI\Icon.ico

MUI_UNICON icon_file
The icon for the uninstaller.
Default: ${NSISDIR}\Contrib\Graphics\UltraModernUI\UnIcon.ico

MUI_HEADERIMAGE
Display an image on the header of the page.

MUI_TEXT_COLOR (color: RRGGBBR hexadecimal)
Text color for all the pages.
Default: FFFFFF

UMUI_TEXT_LIGHTCOLOR (color: RRGGBBR hexadecimal)
Text color for GroupBox, CkeckBox and OptionBox of all the pages.
Default: FFFF00

MUI_BGCOLOR (color: RRGGBBR hexadecimal)
Background color for all the pages.
Default: 3D66AB

UMUI_HEADERIMAGE_BMP bmp_file
Bitmap image to display on the header of installers pages.
Default: ${NSISDIR}\Contrib\UltraModernUI\Skins\blue\Header.bmp

UMUI_LEFTIMAGE_BMP bmp_file
Bitmap image to display on the left of installers pages.
Default: ${NSISDIR}\Contrib\UltraModernUI\Skins\blue\LeftBranding.bmp

UMUI_BOTTOMIMAGE_BMP bmp_file
Bitmap image to display on the bottom of installers pages.
Default: ${NSISDIR}\Contrib\UltraModernUI\Skins\blue\BtmImg.bmp

UMUI_UNHEADERIMAGE_BMP bmp_file
Bitmap image to display on the header of installers pages.
Default: ${UMUI_HEADERIMAGE_BMP}

UMUI_UNLEFTIMAGE_BMP bmp_file
Bitmap image to display on the left of installers pages.
Default: ${UMUI_LEFTIMAGE_BMP}

UMUI_UNBOTTOMIMAGE_BMP bmp_file
Bitmap image to display on the bottom of installers pages.
Default: ${UMUI_BOTTOMIMAGE_BMP}

UMUI_BRANDINGTEXTFRONTCOLOR (color: RRGGBBR hexadecimal)
The front color of the bottom text. Use the BrandingText instruction to replace the default text.
Default: 8B8CA4

UMUI_BRANDINGTEXTBACKCOLOR (color: RRGGBBR hexadecimal)
The back color of the bottom text. It is shifted in comparison with the front text of one pixel to right and down below in order to give relief.
Default: EEEEF3

UMUI_UI ui_file
The interface file with the dialog resources. Change this if you have made your own customized UI.
The MUI_UI define has been renamed in UltraModernUI in order to assure the compatibility with the former Modern UI scripts.
Default: ${NSISDIR}\Contrib\UIs\UltraModernUI\UltraModern.exe

MUI_UI_HEADERIMAGE ui_file
The interface files with the dialog resource IDD_INST that contains a bitmap control and space for the header bitmap.
Default: ${NSISDIR}\Contrib\UIs\modern_headerbmp.exe

MUI_UI_HEADERIMAGE_RIGHT ui_file
The interface files with the dialog resource IDD_INST that contains a bitmap control and space for the header bitmap on the right side.
Default: ${NSISDIR}\Contrib\UIs\modern_headerbmpr.exe

UMUI_UI_COMPONENTSPAGE_SMALLDESC ui_file
The interface files with a customized dialog resource IDD_SELCOM with a small description area.
The MUI_UI_COMPONENTSPAGE_SMALLDESC define has been renamed in UltraModernUI in order to assure the compatibility with the former Modern UI scripts.
Default: ${NSISDIR}\Contrib\UIs\UltraModernUI\UltraModern_smalldesc.exe

UMUI_UI_COMPONENTSPAGE_NODESC ui_file
The interface files with a customized dialog resource IDD_SELCOM without a description area.
The MUI_UI_COMPONENTSPAGE_NODESC define has been renamed in UltraModernUI in order to assure the compatibility with the former Modern UI scripts.
Default: ${NSISDIR}\Contrib\UIs\UltraModernUI\UltraModern_nodesc.exe

UMUI_USE_ALTERNATE_PAGE
Use an alternative Welcome page, Finish page and Abort page that resemble the most recent installers

MUI_WELCOMEFINISHPAGE_BITMAP bmp_file
Bitmap for the Welcome page and the Finish page (recommended size: 164x314 pixels).
Default: ${NSISDIR}\Contrib\Graphics\Wizard\win.bmp

UMUI_WELCOMEFINISHABORTPAGE_INI ini_file
InstallOptions INI file for the Welcome page, the Finish page and the Abort page.
The MUI_WELCOMEFINISHPAGE_INI define has been renamed in UltraModernUI in order to assure the compatibility with the former Modern UI scripts.
Default: ${NSISDIR}\Contrib\UltraModernUI\ioSpecial.ini

UMUI_ALTERNATEWELCOMEFINISHABORTPAGE_INI ini_file
InstallOptions INI file for the Alternate Welcome page, the Alternate Finish page and the Alternate Abort page.
Default: ${NSISDIR}\Contrib\UltraModernUI\ioSpecial2.ini

UMUI_USE_UNALTERNATE_PAGE
Use an alternative Welcome page, Finish page and Abort page that resemble the most recent installers

MUI_UNWELCOMEFINISHPAGE_BITMAP bmp_file
Bitmap for the Welcome page and the Finish page (recommended size: 164x314 pixels).
Default: ${NSISDIR}\Contrib\Graphics\Wizard\win.bmp

UMUI_UNWELCOMEFINISHABORTPAGE_INI ini_file
InstallOptions INI file for the uninstaller Welcome page, the Finish page and the Abort page.
The MUI_UNWELCOMEFINISHPAGE_INI define has been renamed in UltraModernUI in order to assure the compatibility with the former Modern UI scripts.
Default: ${NSISDIR}\Contrib\UltraModernUI\ioSpecial.ini

UMUI_ALTERNATEUNWELCOMEFINISHABORTPAGE_INI ini_file
InstallOptions INI file for the uninstaller Alternate Welcome page, the Alternate Finish page and the Alternate Abort page.
Default: ${NSISDIR}\Contrib\UltraModernUI\ioSpecial2.ini

MUI_LICENSEPAGE_BGCOLOR (/windows | /grey | (color: RRGGBB hexadecimal))
The background color for the license textbox. Use /windows for the Windows text background color (usually white). Use the /grey for the window background color (usually grey).
Default: FFFFFF

MUI_COMPONENTSPAGE_CHECKBITMAP bitmap_file
The bitmap with images for the checks of the component select treeview.
Default: ${NSISDIR}\Contrib\Graphics\Checks\modern.bmp

MUI_COMPONENTSPAGE_SMALLDESC
A small description area on the bottom of the page. Use this layout if you have a lot of sections and don't need large descriptions.

MUI_COMPONENTSPAGE_NODESC
No description area.

MUI_INSTFILESPAGE_COLORS (/windows | (foreground color: RRGGBB hexadecimal) (background color: RRGGBB hexadecimal))
The colors of the details screen. Use /windows for the default Windows colors.
Default: ${MUI_TEXT_COLOR} ${MUI_BGCOLOR}

MUI_INSTFILESPAGE_PROGRESSBAR ("" | colored | smooth)
The style of the progress bar. Colored makes it use the MUI_INSTALLCOLORS.
Default: smooth

MUI_FINISHPAGE_NOAUTOCLOSE
Do not automatically jump to the finish page, to allow the user to check the install log.

MUI_UNFINISHPAGE_NOAUTOCLOSE
Do not automatically jump to the finish page, to allow the user to check the uninstall log.

MUI_ABORTWARNING
Show a message box with a warning when the user wants to close the installer.

MUI_UNABORTWARNING
Show a message box with a warning when the user wants to close the uninstaller.

MUI_PAGE_HEADER_TEXT text
Text to display on the header of the page.

MUI_PAGE_HEADER_SUBTEXT text
Subtext to display on the header of the page.

MUI_WELCOMEPAGE_TITLE title
Title to display on the top of the page.

MUI_WELCOMEPAGE_TITLE_3LINES
Extra space for the title area.
It is not used in the alternate welcome page.

MUI_WELCOMEPAGE_TEXT text
Text to display on the page. Use \r\n for a newline.

MUI_LICENSEPAGE_TEXT_TOP text
Text to display on the top of the page.

MUI_LICENSEPAGE_TEXT_BOTTOM text
Text to display on the bottom of the page.

MUI_LICENSEPAGE_BUTTON button_text
Text to display on the 'I Agree' button.

MUI_LICENSEPAGE_CHECKBOX
Display a checkbox the user has to check to agree with the license terms.

MUI_LICENSEPAGE_RADIOBUTTONS
Display two radio buttons to allow the user to choose between accepting the license terms or not.

MUI_COMPONENTSPAGE_TEXT_TOP text
Text to display on the top of the page.

MUI_COMPONENTSPAGE_TEXT_COMPLIST text
Text to display on next to the components list.

MUI_COMPONENTSPAGE_TEXT_INSTTYPE text
Text to display on next to the installation type combo box.

MUI_COMPONENTSPAGE_TEXT_DESCRIPTION_TITLE text
Text to display on the of the top of the description box.

MUI_COMPONENTSPAGE_TEXT_DESCRIPTION_INFO text
Text to display inside the description box when no section is selected.

MUI_DIRECTORYPAGE_TEXT_TOP text
Text to display on top of the page.

MUI_DIRECTORYPAGE_TEXT_DESTINATION text
Text to display on the destination folder frame.

MUI_DIRECTORYPAGE_VARIABLE variable
Variable in which to store the selected folder.
Default: $INSTDIR

MUI_DIRECTORYPAGE_VERIFYONLEAVE
Does not disable the Next button when a folder is invalid but allows you to use GetInstDirError in the leave function to handle an invalid folder.

For that the  START_MENU page uses the colors of background and of text, you must use  at least the version 2.06 of NSIS

Put the code to write the shortcuts (using CreateShortcut) between the MUI_STARTMENU_WRITE_BEGIN and MUI_STARTMENU_WRITE_END macros:

!insertmacro MUI_STARTMENU_WRITE_BEGIN page_id
...create shortcuts...
!insertmacro MUI_STARTMENU_WRITE_END
      

The page ID should be the ID of the page on which the user has selected the folder for the shortcuts you want to write.

MUI_STARTMENUPAGE_TEXT_TOP text
Text to display on the top of the page.

MUI_STARTMENUPAGE_TEXT_CHECKBOX text
Text to display next to the checkbox to disable the Start Menu folder creation.

MUI_STARTMENUPAGE_DEFAULTFOLDER folder
The default Start Menu Folder.

MUI_STARTMENUPAGE_NODISABLE
Do not display the checkbox to disable the creation of Start Menu shortcuts.

MUI_STARTMENUPAGE_REGISTRY_ROOT root
MUI_STARTMENUPAGE_REGISTRY_KEY key
MUI_STARTMENUPAGE_REGISTRY_VALUENAME value_name
The registry key to store the Start Menu folder. The page will use it to remember the users preference. You should also use for the uninstaller to remove the Start Menu folders. Don't forget to remove this key during uninstallation.

For the uninstaller, use the MUI_STARTMENU_GETFOLDER macro to get the Start Menu folder:

!insertmacro MUI_STARTMENU_GETFOLDER page_id $R0 Delete "$SMPROGRAMS\$R0\Your Shortcut.lnk"

UMUI_CONFIRMPAGE_TEXT_TOP text
Text to display on the top of the page.

UMUI_INSTCONFIRM_TEXTBOX_TITLE text
Text to display on the bottom of the page.

UMUI_CONFIRMPAGE_TEXTBOX function_name
Draw a TEXTBOX in which will be post the current configuration. The function wille be use to add lines.

For example to add the Destination Location and the Start Menu Floder :

Function function_name
!insertmacro UMUI_CONFIRMPAGE_TEXTBOX_ADDLINE \
"$(UMUI_INSTCONFIRM_TEXTBOX_DESTINATION_LOCATION)"
!insertmacro UMUI_CONFIRMPAGE_TEXTBOX_ADDLINE " $INSTDIR"
!insertmacro UMUI_CONFIRMPAGE_TEXTBOX_ADDLINE ""

 ;Only if StartMenu Floder is selected
!insertmacro MUI_STARTMENU_WRITE_BEGIN Application
!insertmacro UMUI_CONFIRMPAGE_TEXTBOX_ADDLINE \
"$(UMUI_INSTCONFIRM_TEXTBOX_START_MENU_FLODER)"
!insertmacro UMUI_CONFIRMPAGE_TEXTBOX_ADDLINE " $STARTMENU_FOLDER"
!insertmacro MUI_STARTMENU_WRITE_END
FunctionEnd

Use the UMUI_CONFIRMPAGE_TEXTBOX_ADDLINE macro to ad lines in the TEXTBOX. Used with a empty string allows to jump a line.
The $(UMUI_INSTCONFIRM_TEXTBOX_DESTINATION_LOCATION) and
$(UMUI_INSTCONFIRM_TEXTBOX_START_MENU_FLODER) variables are defined in the langage files.

MUI_INSTFILESPAGE_FINISHHEADER_TEXT text
Text to display on the header of the installation page when the installation has been completed (won't be displayed when using a Finish page without MUI_(UN)FINISHPAGE_NOAUTOCLOSE).

MUI_INSTFILESPAGE_FINISHHEADER_SUBTEXT text
Subext to display on the header of the installation page when the installation has been completed (won't be displayed when using a Finish page without MUI_(UN)FINISHPAGE_NOAUTOCLOSE).

MUI_INSTFILESPAGE_ABORTHEADER_TEXT text
Text to display on the header of the installation page when the installation has been aborted.

MUI_INSTFILESPAGE_ABORTHEADER_SUBTEXT text
Subext to display on the header of the installation page when the installation has been aborted.

UMUI_INSTFILEPAGE_ENABLE_CANCEL_BUTTON function_name
Enable the instfile page cancel button and call the function_name in case of cancelled. This function must cancel the modifications of the system that there could have had. For the UNPAGE_INSTFILE, this function must begin with "un." .

MUI_FINISHPAGE_TITLE title
Title to display on the top of the page.

MUI_FINISHPAGE_TITLE_3LINES
Extra space for the title area.
It is not used in the alternate finish page.

MUI_FINISHPAGE_TEXT text
Text to display on the page. Use \r\n for a newline.

MUI_FINISHPAGE_TEXT_LARGE
Extra space for the text area (if using checkboxes).

MUI_FINISHPAGE_BUTTON text
Text to display on the Finish button.

MUI_FINISHPAGE_TEXT_REBOOT text
Text to display on the finish page when asking for a system reboot. Use \r\n for a newline.

MUI_FINISHPAGE_TEXT_REBOOTNOW text
Text to display next to the 'Reboot now' option button.

MUI_FINISHPAGE_TEXT_REBOOTLATER text
Text to display next to the 'Reboot later' option button.

MUI_FINISHPAGE_RUN exe_file
Application which the user can select to run using a checkbox. You don't need to put quotes around the filename when it contains spaces.

MUI_FINISHPAGE_SHOWREADME file/url
File or website which the user can select to view using a checkbox. You don't need to put quotes around the filename when it contains spaces.

MUI_FINISHPAGE_LINK link_text
Text for a link on the which the user can click to view a website or file.

MUI_FINISHPAGE_NOREBOOTSUPPORT
Disables support for the page that allows the user to reboot the system. Define this option to save some space if you are not using the /REBOOTOK flag or SetRebootFlag.

UMUI_ABORTPAGE_TITLE_3LINES
Extra space for the title area.
It is not used in the alternate abort page.

UMUI_ABORTPAGE_TEXT text
Text to display on the page. Use \r\n for a newline.

UMUI_ABORTPAGE_LINK link_text
Text for a link on the which the user can click to view a website or file.

MUI_UNCONFIRMPAGE_TEXT_TOP text
Text to display on the top of the page.

MUI_UNCONFIRMPAGE_TEXT_LOCATION text
Text to display next to the uninstall location text box.

You can add custom code to the page functions of your Modern UI pages. More info...

MUI_PAGE_HEADER_TEXT text
Text to display on the header of the page.
Default: none

MUI_PAGE_HEADER_SUBTEXT text
Subtext to display on the header of the page.
Default: none

MUI_LEFTMESSAGEBOX_VAR var_name
Return the result in the variable. The return value is:
   type 1: OK=1
   type 2: OK=2  Cancel=3
   type 3: YES=2 NO=3

UMUI_LEFTMESSAGEBOX_LEFTFUNC func_name
The name of the page leave function that will be call. In this Function, you can, for example, use this line that appear the back page:
SendMessage $HWNDPARENT "0x408" "-1" ""

To remember to users preference, you can define a registry key.
Note: These defines should be set before inserting the installation page macro.

MUI_LANGDLL_REGISTRY_ROOT root
MUI_LANGDLL_REGISTRY_KEY key
MUI_LANGDLL_REGISTRY_VALUENAME value_name
The registry key to store the language. The users preference will be remembered. You can also use it for the uninstaller to display the right language. Don't forget to remove this key in the uninstaller.

For the uninstaller, insert the MUI_UNGETLANGUAGE macro in un.onInit to get the stored language preference:

Function un.onInit
!insertmacro MUI_UNGETLANGUAGE
FunctionEnd
      

To customize the language selection dialog interface, use these defines before inserting the MUI_LANGDLL_DISPLAY macro.

MUI_LANGDLL_WINDOWTITLE text
The window title of the language selection dialog.

MUI_LANGDLL_INFO text
The text to display on the language selection dialog.

MUI_LANGDLL_ALWAYSSHOW
Always show the language selection dialog, even if a language has been stored in the registry. The language stored in the registry will be selected by default.