When you install a patch using Windows Installer, the .msp file is cached in the %WINDIR%\Installer directory. This accounts for some of the space required by Visual Studio 2005 Service Pack 1. A single patch is cached only once regardless to how many products the patch applies.
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There are several known issues when installing Visual Studio 2005 Service Pack 1. I’ve documented these below and, when possible, have included workarounds and status on any pending fixes.
Error 1718.File ‘…’ was rejected by digital signature policy
Install Rolls Back and Breaks Applications like Live Messenger
Visual Studio 2005 Service Pack 1 Takes a Long Time to Install
Visual Studio 2005 Service Pack 1 Requires a Lot of Disk Space
Error 2908 –
When installing Visual Studio 2005 Service Pack 1, you may see an error like the following (file name will vary):
Error 1718.File D:WINDOWSInstaller50baad.msp was rejected by digital signature policy.
Knowledge Base article 925336 had originally documented instructions using the Local Security Policy UI to work around this issue based on my previous blog post.