(Solved) Fedora 41 --- Installation: "Problem occurred when opening the package"

[duhr]

I guess I should have make a more thorough search here, on the forum as the issue has already been addressed in another topic. Anyway, adding the solution here in case others may need it:

Fedora 41 insync repo failure [build + repo updated]

So, rpm -e gpg-pubkey-accaf35c-504d6503 does the trick: it removes the key with the old signature and allows the update to bring along the key with the new signature.