I need some help again

Well, garrysmod is not working for me again. However, the game will start up, but it crashes when I try to load a map on singleplayer. Also, when I try to connect to a multiplayer server, it tells me the server is on a different update than I am, but I have the most recent update of garrysmod. Help?

Edit: Yes, I paid for gmod legitly. I don’t usually pirate games, anyway.

Do you have GMod Legit or did you download it?

Also people will you link your fucking accounts properly if you do it on here, you use your community profile not your Steam Name or Steam ID. (Notice how mine actually works)