[2020] game will not load

DXDIAG is a program you run from a command prompt or the Windows start menu 'run' dialog box (or 'search programs' in Windows 7 or later). After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach your Documents/Paradox/CK3/pdx_settings.txt .
From your Documents/Paradox/CK3/logs/ folder, attach system.log , error.log  

We now think this is an issue with dual CPU systems.

CPU or GPU slightly below the minimum requirements should not cause a crash like this. If that is confirmed there will be a hotfix soon to address that problem.

Sorry about that!

In the meantime you can revert the game to version 1.03 in the Steam Betas tab for the game, which does not have that problem.