My online unclass network has no problems, one of my secret class offline networks works just fine, but the other secret class offline any of the MS patches fail with "File is not signed". There is no AV on it, I deleted the patches, deleted from propatches, re-downloaded, same thing. Any ideas?
Verify the files are complete and not corrupted, also update the root certificates on the non-working network since it's used to verify the digital signature of the files. The online network is most likely getting the updated certificates. There is also an outside change the patches are 'blocked', go into the properties of the patches and make sure you don't see an 'Unblock' button in the General tab.