Hi, This is because you likely tried to manually uninstall the CRJ. This is a no-no! You must either use the uninstaller, or let the updater do the uninstall for you! Since you've gone this far, go into your main X-Plane folder and delete the CRJ uninstaller if it's still in there, then run the new 1.1 installer. If you're still experiencing problems after the above steps please contact X-Aviation: http://www.x-aviation.com/catalog/contact_us.php