It is awesome that you want to download The Ultimate Games Master companion app.
The UGM is available on many different platforms which you can find below:
This section contains some optional Ultimate Games Master UGM downloads.
The Server Executable can be used on Windows platforms either locally or in the cloud (for example on AWS) to take control of your games. Although this is never required it does take the load off of your machines.
This final section contains all The Ultimate Games Master documents including the UGM Quick Start Guide and the Main UGM Manual.