MaxPatchCacheSize - Win32 appsIf this per-machine system policy is set to a value greater than 0, Windows Installer saves older versions of files in a cache when a patch is applied to an application. Caching can increase the performance of future installations that otherwise need to obtain the old files from a original application source. The value of the MaxPatchCacheSize policy is the maximum percentage of disk space that th
https://support.microsoft.com/en-us/help/931914/
