How to convert newer Framemaker files to older FM Version

re: An FM2022 trial version is not an option either.

All that's needed for that is a naive machine, perhaps just a virtual machine, for the temporary installation.
For a small number of files, getting someone else to help with the save-back is another path.

It's easily possible that content security would prevent that, but in an enterprise setting like that, I'd push back, through management if necessary, to get the prior document stewards to provide the MIF. My dept. used to routinely generate MIFs, largely because it was hard to predict what FM version the outside translators would have.

In any case, these scenarios are further evidence for why Adobe needs to offer their products as cloud apps, available for short term lease.

Frameexperts ConvertDocs sounds like the answer. https://frameexpert.com/store/index.html

Ok, so the source (FM2022) needs to save the content back into either FM2020 or MIF format. Nothing you can do from the FM2020 end of things. No reason why putting the FM2022 trial on a completely separate machine wouldn't work either for the purposes of back-saving.