on a Mac using the FLRegkey.reg file, you typically need to download the file from your Image-Line account and then import it within the application. This "offline" method is essential if your computer does not have an internet connection or if the standard login method fails. How to Get Your FLRegkey.reg File
For : Expand the section for "Offline Unlock File for Older FL Studio" and click the provided link to download FLRegkey.reg . Flregkey.reg Fl Studio 20 Mac Download