The AlphaTrack driver Control Surface Plug-in for Digital Performer® are no longer being maintained.

If you have questions your best source of information would be the user community for the DAW software you are using.

Archival copies of the driver and plugin can be found at these links:

Alpha Track Driver and Digital Performer Plugin - Mac OS 10-6 through 10-8:
   https://www.synclavier.com/Downloads/AlphaTrack_Installer_Mac_OS_10_6_Through_10_8.pkg.zip

Alpha Track Driver and Digital Performer Plugin - Mac OS 10-9 through 10-13:
   https://www.synclavier.com/Downloads/AlphaTrack_Installer_Mac_OS_10_9_Through_10_13.pkg.zip

Alpha Track Driver and Digital Performer Plugin - Mac OS 10-14 and later including Mac OS 10.15 Catalina:
   https://www.synclavier.com/Downloads/AlphaTrack_Installer_Mac_OS_10_14_And_Later.pkg.zip