Downloaded the file for Win7, also Gpg4Win. Mentioned .asc file did not accompany Tor, in spite of the description on the Torsite. Other ways of verification I could not find. Nevertheless I followed the description involving Gpg4Win under "How to verify signatures for packages" via cmd.exe, it did not work.

How can I verify Tor Browser?

PS:Gpg seems not to be in English available?