As mentioned, this package is a very preliminary pre-beta build of SP1 instead of an actual beta build. It is also a standalone update pack that can be installed in any edition of Vista RTM and is not a fully integrated and slipstreamed SP1 ISO unlike the previously released Vista SP1 build 6001.16549. After patching with SP1, you will see your system information showing that the system is running Vista Ultimate, Service Patch 1, v.249, with version build as 6.0.6001.16633 (longhorn.070803-1655).

x85 Vista: windows6.0-kb936330-x86.exe – 684.71 MB
x64 Vista: windows6.0-kb936330-x64.exe – 1.09 GB