Adding some additional info ^.^
If you already tried everything / including downloading the newer FH & made sure that no files were missing or actually got corrupted then it could be a few things:
- Internet. I noticed that you didn't list anything about resetting your router so you can give that a shot? Sometimes doing that can actually get the game to work in case it was your internet.
Running the game as an administrator. Right click the icon of the game and then click 'Run as Administrator'. It helps some floofs out so it might help you out as well.
Cloudflare. Judging on location of the user and since that whole cloudflare incident back awhile ago, users still have issues getting onto the game, especially users in Brazil. Even users that's out in Brazil so it could be a possibility that it's down for you in your area, location and hopefully it'll be up and running.
Cellular Device / Another Computer. Have you tried logging into your mobile device / another computer if you have o maybe that'll clear it up for you so you can get on.
Hopefully I'm not missing anything but good luck ~!