Fixing Nitro Pro Setup Wizard "Ended Prematurely" Error If you are seeing the message it means the installer was interrupted by a system conflict, corrupted file, or insufficient permissions before it could complete. Your system remains unmodified, but you cannot use the software until this is resolved. Quick Fixes to Try First
If the installer is an .exe that wraps an .msi : nitro pro setup wizard ended prematurely because of an error
Also, set the environment variables correctly: Fixing Nitro Pro Setup Wizard "Ended Prematurely" Error