Learn how to turn on or off Developer Mode in Windows 11/10 using Settings, GPEDIT & REGEDIT. You don't require a Developer License to develop!

Microsoft says No, but here is how to install Windows Updates in Safe Mode. Make sure to rerun the updates once you boot back normally to fix any glitches.

Letting anyone developer unlock their Windows 10 device means you can install apps, not from the Windows Store. Such apps could be ones that do not conform to the Store's codes, or for other reasons.