If you have , ReShade , Special K , or RivaTuner Statistics Server running in the background, close them completely. These tools hook into steamclient64.dll to modify memory. If they hook it before the game initializes, the game sees a "loaded" but "invalid" library and throws this error.
Difficulty: Moderate Time to fix: 15–30 minutes unable to load library steamclient64dll fixed
Few things are as frustrating as settling in for a gaming session, clicking "Play" on a title (often a cracked or repacked version of a game, or a legitimate one using certain emulators), and being met with a stark error message: If you have , ReShade , Special K
Game on.