If you have legitimately purchased a tool and are looking for your key:
If you're looking to get started with your own recovery, I can help you with: Where to find official macOS DMG files. Troubleshooting a USB drive that won't boot. Alternative tools if you are on a strict $0 budget. Which part of the macOS recovery process are you working on right now? Ultra Dmg License Key
UltraDMG is that typically offers a trial version. If you have legitimately purchased a tool and