Hello,
so i tried installing the Qualitywings 757 in FSX-SE, and since it was updated about 2 years ago it came with the an old version of the addon manager. It installed that addon manager on my computer and when i tried running the sim. i pressed never run addon manager thinking i would still have the most up to date one. when i spawned in, the addon manager menu has disappered and now i tried everything i can but it still wont come back. is there a way to try to run the coatl that is responsible for addon manager?