Tested with opsi 4.0.3
requiredWinstVersion >= 4.10.8.6
Tested with R 3.0.2
By — adlerweb 2014/02/27 14:43

Files can be downloaded at http://cran.rstudio.com/bin/windows/base/

Tree:
setup.ins
uninstall.ins
delsub.ins

[Actions]
requiredWinstVersion >= "4.10.8.6"
 
DefVar $ProductId$
DefVar $MinimumSpace$
DefVar $UninstallProgram$
 
Set $ProductId$       = "r"
Set $MinimumSpace$    = "150 MB"
 
 
ShowBitmap "%ScriptPath%\" + $ProductId$ + ".png" $ProductId$
 
if not(HasMinimumSpace ("%SystemDrive%", $MinimumSpace$))
	LogError "Not enough space on %SystemDrive%, " + $MinimumSpace$ + " on drive %SystemDrive% needed for " + $ProductId$
	isFatalError
	; Stop process and set installation status to failed
else
	if FileExists("%ScriptPath%\delsub.ins")
		comment "start uninstall"
		sub "%ScriptPath%\delsub.ins"
	endif
 
	comment "installing"
 
	comment "Start setup program"
	Winbatch_install
 
endif
 
[Winbatch_install]
 "%ScriptPath%\R-3.0.2-win.exe" /silent

[Actions]
DefVar $ProductId$
DefVar $UninstallProgram$
 
Set $ProductId$       = "r"
 
ShowBitmap "%ScriptPath%\" + $ProductId$ + ".png" $ProductId$
 
if FileExists("%ScriptPath%\delsub.ins")
	comment "start uninstall"
	sub "%ScriptPath%\delsub.ins"
endif

;Version 3.0.2
Set $UninstallProgram$ = "%ProgramFilesSysnativeDir%\R\R-3.0.2\unins000.exe"
if FileExists($UninstallProgram$)
	Message "Found "+$ProductId$+" => uninstalling first"
	Winbatch_uninstall
endif
 
[Winbatch_uninstall]
 "$UninstallProgram$" /silent