Ok, so I searched and threads on this topic seem to offer no solution to this error. Nothing logged to %appdata%/rsilauncher/log.log. Nothing logged to game.log in the LIVE folder. I wish there was a better error message! I've been running SC without issued for years, never had any issues updating the game. Now I take a couple of months off, perhaps missed a patch or two, and now when I upgrade to the latest version I get this error on launch. That tells me something is off with the delta patcher. I did upgrade to Windows 11 since last time I played, and the graphics driver. So complete reinstall then?