Pro Tools Error Message: “Not a valid 64-bit AAX plug-in”

This article walks you through a solution for the "Not a valid 64-bit AAX plug-in” Pro Tools error message.

Pro Tools users may encounter the following error message if there are two versions of Auto-Tune Pro 9.1 installed on the same machine:



To resolve this issue, please follow the steps below:

1. Manually uninstall Auto-Tune Pro 9.1. 
   • To perform a manual uninstall, go to these locations on your hard drive and delete any Auto-Tune Pro plugin files you find there:
     • macHD/Library/Audio/Plug-Ins/Components
     • macHD/Library/Application Support/Avid/Plug-Ins/Antares Audio Technologies
     • macHD/Library/Application Support/Digidesign/Plug-Ins
     • macHD/Library/Audio/Plug-Ins/VST3
     • macHD/Library/Audio/Plug-Ins/VST
   • Very important: please make sure to only delete Auto-Tune Pro components, and not other plug-in components.
2. Restart your computer.
3. Install Auto-Tune Pro 9.1. You can find the installer package here.

Auto-Tune Pro 9.1 should now be ready to use. Re-open Pro Tools and let it scan for plug-ins.