Failed to connect! :'(

I recently bought Horizon Diamond so that I could Mod Forza Horizon. I have never had a problem with Horizon until now, I have been modding World at War. Once I bought Diamond I was trying to figure out how to use it. Horizon told me to sign in and I did but then I decided to call it a night. Now whenever I open it I get this message “Failed to connect to server!” followed by “Horizon is running in offline mode! You have limited access to modding tools!” What should I do? I reset my Router and my CPU. I deleted Horizon and then downloaded it again :anguished:

Try uninstalling Horizon and reinstalling from this link: https://www.horizonmb.com/client/v2/Horizon.Setup.v2.8.1.1.exe