Alex is still using phpBB version 2, I believe. Version 3 has been out for quite a long time now, but as I recall there were a ton of problems upgrading from 2 to 3.
From what I can recall, upgrading from 2 to 3 was an extremely involved process. It wasn't as simple as installing the new version and everything is hunky-dory. I recall a lot of web masters having great difficulty doing so, and a LOT broke their forums all to hell. Many were forced to make all their users reregister in the new install.
With 57, 000 users, I totally understand why Alex hasn't done it yet.
On the other hand, version 3 has several options users here have been begging for for quite a while.
There are tutorials that say this is an easy process, but most are on web host company pages, and involve special scripts the hosts use, that Alex likely doesn't have (else he probably would have done it a long time ago).
Plus, he' s done a ton of customizing to the installation wer're using now. All the customizing would have to be transferred, which can be quite complex process.
I'd love to see it happen too, but hey, it's free, and I'm sure he's got quite a lot to do already.
Still, I hope he's giving it serious consideration for sometime soon. The advanced options in version 3 are far more than well worth the effort.
_________________
I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...