Figure I post here as responses are amazingly fast. I do have a case open and waiting response from TAC but... in the middle of a server rebuild due to a failed upgrade. Ended up running the 81.10 ISO and installing fresh, patched to Take 66 to match my backup (did a migrate export) and then restored (migrate import) into the server. So far so good but not seeing R81.20 listed available and if I manually upload I get a 'your partitions are not in Check Point standard'.
This is a clean Dell R730/81.10 install so not really sure why it would be complaining. Reading the release notes I don't see anything about partition requirements except one part that mentions it should be a 110GB root which mine is 100GB. Would that be it?
See screenshots.