hayseed said: Grotaclas. Thanks once again for your help. As you suspected, the VCRUNTIME file was missing. I used the link you provided, reinstalled the software and successfully launched EU4. Can you give me a non technical explanation of what happened and why installing 1.31.6 caused it? Thanks. MarcThe latest game patch requires the latest version of MS Visual C++ 2015/17/19, which your Windows installation lacked.