Can't access non-upgraded MediaWiki

So, I’m trying to access an old MediaWiki to get some information off it. I set it up back in 2013, and it was last upgraded in 2015.
It looks like DH have upgraded some underlying PHP stuff, and now I can’t access anything - I get an error

Fatal error: Call to undefined function wfLoadExtensionMessages() in /home//.com/wicked/extensions/DiscussionThreading/DiscussionThreading.php on line 54

Now, I haven’t touched web stuff in years, so I’m a bit lost as to what to do… but I need access to the info held within.

Can some kind soul talk me through upgrading the system to the point where I can pull the info off (I’ll probably deprecate it after that, anyway)



Argh, I had to go through something like that once (having to recover data from an old site). Google result suggest to trying disabling the extension or comment out the offending line, maybe that’s enough. See Try that and let us know how that goes.