You can upgrade your license through the Microsoft Store to unlock BitLocker.
If you lose this key and your hardware changes or you forget your PIN, your data is permanently lost. bitlocker drive encryption download
BitLocker is included in the editions of Windows 10 and 11 . It is typically not available on the Home edition. To check if you have it: Open the Start Menu and type "Manage BitLocker." Select the BitLocker Drive Encryption Control Panel item. You can upgrade your license through the Microsoft