The dokuwiki code is horribly out of date, there have been numerous security and full releases since. I think I’ve tried upgrading it once in the last couple of years and had to revert to backup because that failed horribly.
I’ll probably start with a vanilla dokuwiki install this time and copy the content over. I’ll leave most of the plugins out for starters, since those were the biggest issue in the update process. I’ll try to get the phpBB auth stuff back in, but tbh I’d rather have a clean, secure dokuwiki install than this old mess we have now.
In short, wiki will go trhu some stuff, be partially unavailable and whatnot for some time this weekend