rmdir ~/Library/Application\ Support/XLN\ Audio/Addictive\ Drums\ 2

Open the online installer while your external drive is connected so it can re-index the cache. Audio Units (AU) Validation Failure

: If using an external drive, ensure it is formatted correctly for Mac (APFS or Mac OS Extended) to avoid read/write errors during the placement process.

Some users ask if they can simply alias the folder. You cannot. macOS aliases do not work for deep plugin dependencies. You can use Terminal to create a symlink:

If your installation package strictly requires the execution of the Library Placer tool to generate the necessary configuration files, you can use a Windows compatibility layer on your Mac. Step 1: Download a Compatibility Tool