@Simon_Risberg
Hm. There are cases on MacOS when the Zwift app will not launch, but the days when OSX would crash is rare these days.
I noticed that you’re still running v.OS 10.14? Your MacBookPro15 looks reasonably new - is it capable of running the latest OS update? If you’re ok with doing that, please do.
If you’re intentionally not auto-updating the OS, that’s ok too. Whether you run Mojave or Catalina OS, please read through this post and try those tips. This is the Mac OS fix for occasions when the game app won’t launch properly and that looks like the game app crashed.
Let us know if that works? If no, I’m going to ask you to email your log files to us.