V. Serious problem with FlyByWire install

I am unable to find anything worthwhile on Google or any of the forums. I am now starting to think that maybe it’s time to write off the £110 I paid for MSFS plus the £165 I paid for the Thrustmaster kit and just call it a day. This whole FS stuff is slowly dragging me down with all it’s problems. Lots of posts on Google confirm there are problems with MS Store, but none are able to suggest a fix. I’m not usually a one for giving up easily, but constantly banging my head against a wall is starting to hurt!