Please download the latest version of MusicFab at https://musicfab.org/download.htm
As for how to activate/authorize MusicFab: 1. Start up MusicFab and get into the main interface of MusicFab, click on Menu button(☴) at the top-right corner of MusicFab screen. 2. Find "Authorize" to enter your registered email and its password at Member Center to activate/authorize MusicFab on the computer.