We understand your frustrations! The Aetherlight has a lot of bugs and very little funding. Everyone working on this game aren’t even getting paid, they are volunteers. Once season two is out I'm sure there will be advertising aplently, but for now we ask for your patience as the devs and mods are really doing the best they can.
I recently had the same problem you were having, it was a painstakingly long process, I had to do a lot of uninstalling and reinstalling. Running the app as admin helped me I think... Also you can search "companion engines" on the search bar here and some troubleshoots should come up!