Hey @GWeck , I made a post over at my thread about How To Verify Signatures and I did my best to make the video I made accurate and engaging.
I saw your post about:
Then verify the signature of the iso via the context menu entry Decrypt and verify , applied to the file Qubes-R4.1.0-alpha20201014-x86_64.iso.asc , which must be stored in the same directoy as the corresponding iso file Qubes-R4.1.0-alpha20201014-x86_64.iso . This context menu entry should be available if gpg4win was installed with the GPGex option.
Can you clarify and give an example about the decrpt command in the reference you are using?
Also @adabsurdum click the link in this reply, that should help.