In order to offer more choices and a smaller download, the Vista SP1 release was separated into two releases: X86 and X64 packs. Additionally since Vista SP1 shares the same core as Server 2008, compatibility for Server 2008 has been added to both the X86 and X64 releases.

Note: Downloading the X86 release will not remove X64 releases and vice-versa. In order to remove any un-wanted updates, you will need to delete the module folder and re-download all releases.