Added a check to installer for runtime dlls required to run blender. If

not found on their system, it will open a browser window to point them
at the download site.

DEV NOTES: Anyone building the NSIS installer will need the Moreinfo
plugin - http://nsis.sourceforge.net/MoreInfo_plug-in

release/windows/installer/00.sconsblender.nsi

@@ -5,6 +5,8 @@
 ;
 
 !include "MUI.nsh"
+!include "FileFunc.nsh"
+!include "WordFunc.nsh"
 
 Name "Blender VERSION" 
 
@@ -32,6 +34,9 @@ Page custom DataLocation
 !insertmacro MUI_UNPAGE_INSTFILES
 !insertmacro MUI_UNPAGE_FINISH
 
+!insertmacro Locate
+!insertmacro VersionCompare
+
 
 Icon "00.installer.ico"
 UninstallIcon "00.installer.ico"
@@ -153,8 +158,43 @@ Function GetWindowsVersion
 
 FunctionEnd
 
+# Uses $0
+Function openLinkNewWindow
+  Push $3 
+  Push $2
+  Push $1
+  Push $0
+  ReadRegStr $0 HKCR "http\shell\open\command" ""
+# Get browser path
+    DetailPrint $0
+  StrCpy $2 '"'
+  StrCpy $1 $0 1
+  StrCmp $1 $2 +2 # if path is not enclosed in " look for space as final char
+    StrCpy $2 ' '
+  StrCpy $3 1
+  loop:
+    StrCpy $1 $0 1 $3
+    DetailPrint $1
+    StrCmp $1 $2 found
+    StrCmp $1 "" found
+    IntOp $3 $3 + 1
+    Goto loop
+ 
+  found:
+    StrCpy $1 $0 $3
+    StrCmp $2 " " +2
+      StrCpy $1 '$1"'
+ 
+  Pop $0
+  Exec '$1 $0'
+  Pop $1
+  Pop $2
+  Pop $3
+FunctionEnd
+
 Var BLENDERHOME
 Var winversion
+Var DLL_found
 
 Function SetWinXPPath
   StrCpy $BLENDERHOME "$PROFILE\Application Data\Blender Foundation\Blender"
@@ -171,6 +211,37 @@ Function .onInit
   !insertmacro MUI_INSTALLOPTIONS_EXTRACT "data.ini"
 FunctionEnd
 
+!define DLL_VER "8.00.50727.42"
+
+Function LocateCallback
+
+	MoreInfo::GetProductVersion "$R9"
+	Pop $0
+
+        ${VersionCompare} "$0" "${DLL_VER}" $R1
+
+        StrCmp $R1 0 0 new
+      new:
+        StrCmp $R1 1 0 old
+      old:
+        StrCmp $R1 2 0 end
+	; Found DLL is older
+        Call DownloadDLL
+
+     end:
+	StrCpy "$0" StopLocate
+	StrCpy $DLL_found "true"
+	Push "$0"
+
+FunctionEnd
+
+Function DownloadDLL
+    MessageBox MB_OK "You will need to download the Microsoft Visual C++ 2005 Redistributable Package in order to run Blender. Pressing OK will take you to the download page, please follow the instructions on the page that appears."
+    StrCpy $0 "http://www.microsoft.com/downloads/details.aspx?familyid=32BC1BEE-A3F9-4C13-9C99-220B62A191EE&displaylang=en"
+    Call openLinkNewWindow
+FunctionEnd
+
+
 Var HWND
 Var DLGITEM
 Var is2KXP
@@ -267,6 +338,15 @@ Section "Blender-VERSION (required)" SecCopyUI
   WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Blender" "DisplayName" "Blender (remove only)"
   WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Blender" "UninstallString" '"$INSTDIR\uninstall.exe"'
   WriteUninstaller "uninstall.exe"
+
+  ; Check for msvcr80.dll - give notice to download if not found
+  MessageBox MB_OK "The installer will now check your system for the required system dlls."
+  StrCpy $1 $WINDIR
+  StrCpy $DLL_found "false"
+  ${Locate} "$1" "/L=F /M=MSVCR80.DLL /S=0B" "LocateCallback"
+  StrCmp $DLL_found "false" 0 +2
+    Call DownloadDLL
+  
 SectionEnd
 
 Section "Add Start Menu shortcuts" Section2