You could also try:
Run from cmd(win+r and type cmd, then enter the path to the exe) and see if it outputs an error
Run from zip version you can find on github https://github.com/FAForever/downlords-faf-client/releases/tag/v1.2.0
Run from code how to with video in the read me https://github.com/FAForever/downlords-faf-client#how-to-run see if it oututs errors
But really I thnk it is the client.prefs file that is somehow fucked up