The Gallery integration module for phpBB2 can be downloaded here – you need to create a user account before the download:

http://www.nukedgallery.net/downloads-cat12.html

This module can be easily installed with the Easy MOD installer for phpBB.

Please mind that the application integration can be a difficult and a time consuming procedure.

If you need assistance with the phpBB-Gallery integration, please post a ticket in Exclusive Professional Services -> Application Integration.