"The installation source for this product is not available."
I recently had to install VS 2005 SP1 on a Windows 2003 server that was hosting a development environment. After firing up the setup process I was presented with this error message on my screen;
Looking in the Event Log I also found this entry around the time the error message was generated;
Event Type:Error
Event Source:MsiInstaller
Event Category:None
Event ID:1008
Date:12/18/2006
Time:12:18:31 PM
Description:
The installation of C:DOCUME~1…LOCALS~1TempZNWA0VS80sp1-KB926601-X86-ENU.msp is not permitted due to an error in software restriction policy processing. The object cannot be trusted.
After doing a bit of research I came across others who had experienced the same problem and they directed me to this Knowledge Base artcile http://support.microsoft.com/default.aspx/kb/925336 which provided the solution. After applying the update and rebooting the server I was able to install the Service Pack.