If you’re sure you’re typing the licence correctly, this problem could be related to an installation error. On version 2.2 or newer Please follow this procedure: Remove the plane’s folder from X-Plane Install the original aircraft folder (for instance, the
On a Mac, I get an error message or the switches are not working
For example, you see the pilots while in cockpit view, the switches are not clickable or you get this error message: This is related to a corrupted installation. To fix this please follow the procedure stated in the following FAQ: http://www.simcoders.com/faqs/i-get-the-invalid-product-licence-error/