Hi here's article I created. W10 has several ways to recover. You can create installation media to repair or reinstall windows 10. Don't worry about the license if the device had W10 installed. Let me know if you need further help and I'll try to help you. You can create your own installation media.
Windows has several ways to get your PC up and running when you have a issue.
When you boot into the Advanced Startup mode, you will find several options that can help you fix problems. Here's a good link by HTG that explains this really well. It's a good place to start. https://www.howtogeek.com/131916/ho...artup-options-to-fix-your-windows-8-computer/
Here's a tip if Windows won't boot!
If your PC isn’t loading Windows 10 and you don’t have the operating system installation files, you can use the following trick.
Start your computer and follow the POST, when Windows should begin loading, press the power button to shutdown your computer.
Repeat the previous step twice, and in the third restart the operating system should enter into the Windows Recovery Environment (Windows RE), where a number of diagnostics will be performed to try fix any booting issues, but you will also get an option to access the Windows Startup Settings.
Here's 6 ways to recover W10. They are listed in the order that I would try. Hope this helps someone. https://support.microsoft.com/en-us/help/12415/windows-10-recovery-options