I'm *fairly* certain both extensions are up to date, since I acquired both through Forge, so there is no reason they shouldn't be.
When you say delete and re-update Fantasy Grounds, you mean the entire program? I'm sure I could do that, but i'd need to back up a few things.
I've tried it in a fresh campaign using only those extensions, which seems to suggest that it is due to the file renaming you mention.
I've generated logs of the error, though i'm not sure which ones are important, this one seems to contain the actual exception...?
https://pastebin.com/YRg6pAuD