Error Messages

Well for 2 years league has worked great and everything went clean but now when i try to load the game it sends errors no matter what i tried or did. I tried to re-download the game but the website is so outdated it keeps giving me the old and i cant get to the new no matter what I follow. I need help I want to play league with a friend but now I cant please give me an option fast so i can play league again without the Errors that wont let me log in or play or even talk to online friends.