I get this issue:
wpForo Forum Installation | 99% (55064 / 55643)
Forum users' profile data are not synchronized yet, this step is required! Please click the button below to complete installation.
And it never synchronized. I tried it twice but not again for fear of breaking something
And the VPS my website has been on has been crashing, siteground is trying to figure out why but I feel the forum may be related because I haven't really touched anything else.
Do you think the number of users is an issue? They're not even all active, not by a loooong shot, but just too many entries?
Some users data are not healthy in your WordPress users table, so the synching cannot be performed. Please ignore this message, till will not cause any issues. Just navigate to Dashboard > Forums > Settings > Features Tab and set "Yes" the "Turn Off User Syncing Note" option.