Most people don't know this, but you can convert your existing Windows 10 Home or Professional system to Windows 10 Enterprise in just a few minutes--no disc necessary. You won't lose any of your installed programs or files. To do this, you'll need a product key, but there's a bit of a loophole here: You don't actually need a legitimate product key to use Windows 10, Enterprise or otherwise. To upgrade, you just need a key.