Welcome and Finish pages are not MUI
NSIS 2.35,
Welcome and Finish pages looks not as "modern":
C:\Program Files\NSIS\Examples\Modern UI\WelcomeFinish.nsi
;NSIS Modern User Interface
;Welcome/Finish Page Example Script
;Written by Joost Verburg
;--------------------------------
;Include Modern UI
!include "MUI2.nsh"
;--------------------------------
;General
;Name and file
Name "Modern UI Test"
OutFile "WelcomeFinish.exe"
;Default installation folder
InstallDir "$LOCALAPPDATA\Modern UI Test"
;Get installation folder from registry if available
InstallDirRegKey HKCU "Software\Modern UI Test" ""
;Request application privileges for Windows Vista
RequestExecutionLevel user
;--------------------------------
;Interface Settings
!define MUI_ABORTWARNING
;--------------------------------
;Pages
!insertmacro MUI_PAGE_WELCOME
!insertmacro MUI_PAGE_LICENSE "${NSISDIR}\Docs\Modern UI\License.txt"
!insertmacro MUI_PAGE_COMPONENTS
!insertmacro MUI_PAGE_DIRECTORY
!insertmacro MUI_PAGE_INSTFILES
!insertmacro MUI_PAGE_FINISH
!insertmacro MUI_UNPAGE_WELCOME
!insertmacro MUI_UNPAGE_CONFIRM
!insertmacro MUI_UNPAGE_INSTFILES
!insertmacro MUI_UNPAGE_FINISH
;--------------------------------
;Languages
!insertmacro MUI_LANGUAGE "English"
;--------------------------------
;Installer Sections
Section "Dummy Section" SecDummy
SetOutPath "$INSTDIR"
;ADD YOUR OWN FILES HERE...
;Store installation folder
WriteRegStr HKCU "Software\Modern UI Test" "" $INSTDIR
;Create uninstaller
WriteUninstaller "$INSTDIR\Uninstall.exe"
SectionEnd
;--------------------------------
;Descriptions
;Language strings
LangString DESC_SecDummy ${LANG_ENGLISH} "A test section."
;Assign language strings to sections
!insertmacro MUI_FUNCTION_DESCRIPTION_BEGIN
!insertmacro MUI_DESCRIPTION_TEXT ${SecDummy} $(DESC_SecDummy)
!insertmacro MUI_FUNCTION_DESCRIPTION_END
;--------------------------------
;Uninstaller Section
Section "Uninstall"
;ADD YOUR OWN FILES HERE...
Delete "$INSTDIR\Uninstall.exe"
RMDir "$INSTDIR"
DeleteRegKey /ifempty HKCU "Software\Modern UI Test"
SectionEnd
Thanks.