Installed on Dolphin 7.3.1, and working perfectly. Code changes required to core files. Instructions had incorrect line numbers, but if you know a little about PHP - its easy enough to work it out. Only criticism. If you have an existing user and you want to make them an admin user, there is no way of doing this via the gui. The module only provides a method of creating new admin users. This can be solved with a quick SQL hack. Despite the above, I still thoroughly recommend this module.