If you get "requires a different private key", go back to the first page and re-extract keys. With v1.3, watch for the final message, it should say
"Primary and # secondary keys (0 bogus)".

If it didn't recover the primary, you can reindividualize - this will put the primary as a secondary key (which are easier to recover).

If it reports bogus keys, there's a bug in FairUse4WM 1.3 v1.3.

If it doesn't recover any keys, then the parsing code of viodentia wasn't flexible enough to handle this particular variety.