The One Click installation for phpBB is using a pretty old version (3.0). Can this be updated to 3.1 or 3.2? There were some major changes made between 3.0 and 3.1 making an automatic update impossible.
I’d recommend that you simply install it yourself. Sure there is a learning curve the first time you do it, but once you’ve done it a time or two you’ll be able to install faster than the one click gets it installed.
There used to be a wiki-page with instructions for the fastest method, I haven’t been able to find the equivalent in the new help database. (Maybe someone from Dreamhost can link it for us.) The upshot is this tho, don’t follow instructions that have you unzipping files on your local computer then uploading. It’s much faster to follow instructions that have you open a shell session and use wget and unzip directly on the server. (this method takes seconds as opposed to hours if you unpack locally first.)