To obtain a legitimate registration key, you must have a registered Image-Line account Generate a Validation File : For FL Studio 20.9 or later, open FL Studio, go to Unlock FL Studio , and select
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Lockheed Martin\Prepar3D v5] "ActivationStatus"="Valid" "UserId"="your_email@domain.com"
Conclusion
Go to your account page, usually found under the "My Account" or "My License" section. Find your License: Locate your FL Studio license details.