Process returned unknown error code occurs in Dreadnought when “OPENSSL_ia32cap” variable is missing.
Fix 1: Restore “OPENSSL_ia32cap” variable
- Go to your file explorer.
- Find “This PC” and right-click on it.
- Click Properties.
- Now go to Advanced System Settings > Environment Variables > System Variables.
- Create a new variable and rename it to “OPENSSL_ia32cap“.
- Set its value to “~0x200000200000000“.
- Save it.
- Launch Dreadnought.
It will fix “Process returned unknown error code”.