http://askdm7hr4obajor6nu7zldqesdzk7tsbhitwnn7qb3xsebr4l7fixqid.onion/docs/INSTALL.html
If you have shell access to your account (via telnet or ssh for example) you may want to upload the entire phpBB archive (in binary mode!) to a directory on your host and unarchive it there. If you do not have shell access or do not wish to use it, you will need to decompress the phpBB archive to a local directory on your system using your favourite compression program, e.g. winzip, rar, zip, etc.