Logic X is a 64-bit program and will only recognize 64 big plug-ins. The ARIA player is available as a 32-bit or 64-bit plug in. To make sure that the ARIA player is running in 64-bit mode:
- Close Logic X.
- Go to Applications > Garritan ARIA Player
- CONTROL+click on the ARIA Player icon and choose Get Info.
- Uncheck Open in 32-bit mode.
- Relaunch Logic X and the ARIA Player should now appear.