[2023] EUIV Not launching on MacOS High Sierra

Is it the game or the launcher that won't run? Because there is an issue with the new launcher where it won't run on older OSs now.

If that is the situation, can you update your macOS?  

Are you sure of that? Any Mac newer than about 2011 ought to be able to be updated ... the reason it no longer runs is the underlying Electron code needed to be updated for security and performance reasons.

We have a source of the older launcher for Windows

Paradox Launcher v2.2023.14 Will not open on Windows 7

Pretty much what it says. I'm aware Windows 7 is super old and is indeed slated to no longer operate Steam in the New Year, hence my shopping around for an upgrade, but it's frustrating when such an update breaks your setup without warning. After... forum.paradoxplaza.com but not Mac as yet I'm afraid!