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:

  1. Close Logic X.
  2. Go to Applications > Garritan ARIA Player
  3. CONTROL+click on the ARIA Player icon and choose Get Info.
  4. Uncheck Open in 32-bit mode.
  5. Relaunch Logic X and the ARIA Player should now appear.