If the game worked once but now crashes to a black screen on the second launch, Windows is likely choking on cached shaders. Open the Windows utility. Select your main OS drive.
The "New" crackfix refers to the iteration designed to work with the latest version of the game, ensuring that players who own the game (but want to play offline or without DRM overhead) can do so without the game's notorious stability bugs. Key Features of Recent Stability Patches anno 1800 crackfixempress new