With Steam, I tried opening Spiral knights at around 6pm EST, it registered me as playing but no window popped up. I uninstalled local game content and tried again, and now the game is stuck at 99% installation telling me the game needs an update, which I can't do because it isn't installed, not sure if this will be fixed during the next patch or whatever but any advice would be appreciated, thanks.
Please try these steps to completely uninstall Spiral Knights from Steam. Unfortunately Steam's uninstall mechanism can leave some files behind on Windows computers that can affect the next install.