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Whenever I start a game (spectate or actually playing) I get this "Error" message stating I have outdated video card drivers. I have the latest Drivers for my video card. Out of curiosity, I updated them again, which the actual display driver version number remained the same.
I have a Radeon HD 4850. It's old but runs the game great.
Attached is the error message. Message started popping up after the 3.04 patch. It allows me to play, but tabs the game out and opens my browser to the league support page. Rather annoying.