Signature verification failure

Greeting’s

I’ve downloaded Whonix images and I have successfully imported the signing key (Whonix ™ Signing Key). I have also established trust for the said key and verified that by checking in Kleopetra that the key is now listed under Trusted certificates. I am however, unable to verify integrity of the downloaded images with an error - “could not determine whether this is an S/MIME or an OpenPGP signature - maybe it is not a signature at all?” Can anyone tell me where I may be going wrong?

Kleopatra has been problematic in past.
See:

Try using gpg command line.