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On Windows and Linux the installer provides the option to install MuseScore during setup. MuseScore is free software that will allow you to view, edit, and convert MusicXML files created by AnthemScore to PDF. If you already have music notation software installed that can import MusicXML files, you may skip this step, although installing MuseScore will allow sheet music to be displayed automatically when you open a song. If you already have MuseScore installed, you can can use "Tools->Set path to MuseScore" in the program menu to set the path to the MuseScore executable.
To install on OS X, download the .dmg file and drag the app to the Applications folder. MuseScore can be installed from the official website.
AnthemScore was tested on Ubuntu 16.04. After the installation, you'll need to create the directory '/usr/local/Qt-5.7.0' and copy the 'lib' and 'plugins' folders from the installation folder (default is ~/AnthemScore) to this location. Then run "sudo apt-get install libxcb-xinerama0". You may need to install the gstreamer 1.0 good, bad, and ugly packages if you don't have them already. For some more info, check out the Qt multimedia page. Super user permission is needed during installation for the license utility.