I am not an expert when it comes to technical issues but here is what comes to my mind:
- Try the solutions listed here: Common Technical Issues and solutions. (READ FIRST)
- Make sure your Anti-Virus/Firewall is not blocking anything. Stop any other programs running to eliminate conflicts (even discord).
- Make sure you are starting the game as Administrator.
- Try verifying the files via Steam (refer to point 2)
- Try re-installing Steam: Crash on launch
- Try starting a game without BattleEye to eliminate BattleEye as the potential cause.
- Unsubscribe from any mods and remove the mod folder, just to make sure no mods are loaded.
- Try the solutions listed here: https://windowsreport.com/conan-exiles-launch-issues/
Good Luck!