If you have Windows 11 Home and want Pro features (like BitLocker or Remote Desktop), you can technically "switch" versions using generic keys to test features, though it will not be permanently activated without a digital license.

Where to buy safely (not eBay or random forums):

These keys are usually stolen or generated using prohibited tools that violate Microsoft’s Terms of Service. System Instability:

OEM keys are sold by PC builders and authorized resellers. These are single-use keys that never expire.