wendigomountain wrote: ↑Mon May 23, 2022 5:52 pm
I am looking to revive an old forum I had back in 2014. It has four extensions that I am sure are no longer active.
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If it was phpBB 3.0.9 then it's impossible that extensions were used as they didn't exist yet. You're probably referring to modifications, usually called mods (short for modifications). As the term modifications implies, this involved editing the phpBB files, whereas the current extensions are addons that do not involve editing the default phpBB files.
Some modifications now exist as extensions but there is not always an upgrade path keeping the old modified data.
AFAIK, Thanks for posts, mchat and REIMG image resizer exist as extensions, NV ADVANCED LAST TOPIC TITLES doesn't (well, not to my knowledge).
Upgrading to the latest version of phpBB is fairly simple: see
Upgrading from 3.0 to 3.3