"Connection failed. You do not have the current version of the client installed."

[CrimsonSpectre]

I get this message every single time I try to play since update 5 went live. I'll get to the splash screen, then it crashes. Rebooting doesn't help, actually nothing I've tried seems to help.

Please tell me I don't have to reinstall the entire game to fix something as simple as this that could be handled with a thirty second download...