Changing the selection in the components page of NSIS based on the OS on which we are installing - nsis

Question

I am finding it difficult to change the selection in the components page of nsis.
The requirement is during installation i get a license agreement page ,if the user agrees then he/she will click on I AGREE ,after the user clicks on I AGREE ,i want to know on which OS the
setup is being installed that is it can be either on a Windows Embedded OS or WinXp/Win7.
So if it is Windows Embedded OS i want to change the installation package and if it is not Windows Embedded OS then the installation package will be different.
I am using MUI ver1 not MUI2 in my project.
Please let me know how this can be achieved.

Answer 1

To test for the OS where the setup is running, you can use macros defined Winver.nsh with those provided with LogicLib.nsh to make elegant tests like this
;Dont't forget to include
!include "LogicLib.nsh" # use of various logic statements
!include "WinVer.nsh" # LogicLib extension for OS tests
A platform test example:
${if} ${AtLeastWin95}
${AndIf} ${AtMostWinME}
;here we are on a pre-win2k
;do something
${elseIf} ${isWin2008}
${orIf} ${AtLeastWin2008R2}
;this is post-win7
;do other thing
${endif}
To change at runtime the components to install, you can use the macros from Sections.nsh:
;if you have
Section "Sample Database" SecApplicationDB
;...
SectionEnd
;you can select or un select by code:
!insertmacro SelectSection ${SecApplicationDB}
;or
!insertmacro UnselectSection ${SecApplicationDB}

Answer 2

WinVer.nsh does not support checking for Embedded NT but you can perform the check yourself:
!include Sections.nsh
!include MUI.nsh
!ifndef VER_SUITE_EMBEDDEDNT
!define VER_SUITE_EMBEDDEDNT 0x00000040
!endif
!insertmacro MUI_PAGE_LICENSE "${__FILE__}"
!insertmacro MUI_PAGE_COMPONENTS
!insertmacro MUI_PAGE_INSTFILES
!insertmacro MUI_LANGUAGE English
Section "Embedded" SID_EMBED
SectionIn RO
SectionEnd
Section "Normal" SID_NORMAL
SectionIn RO
SectionEnd
Function .onInit
System::Call '*(i156,&i152)i.r1'
System::Call 'KERNEL32::GetVersionExA(ir1)'
System::Call '*$1(&i152,&i2.r2)'
System::Free $1
IntOp $2 $2 & ${VER_SUITE_EMBEDDEDNT}
${If} $2 <> 0
!insertmacro SelectSection ${SID_EMBED}
!insertmacro UnselectSection ${SID_NORMAL}
${Else}
!insertmacro UnselectSection ${SID_EMBED}
!insertmacro SelectSection ${SID_NORMAL}
${EndIf}
FunctionEnd