: Launch FL Studio and select "Continue Trial" . The trial is time-unlimited and allows you to use all features and plugins, though you cannot reopen saved projects until you purchase a license. How to Unlock the Full Version Legally
: Run as administrator, accept the license agreement, and follow the prompts. Be sure to keep the ASIO4ALL driver checked for low-latency audio.
: Open the .dmg file and drag the FL Studio icon into your Applications folder.
If you have purchased a license or have a valid serial key, follow these steps to register it:
: Open the downloaded .exe or .dmg file.
The safest way to get started with FL Studio 21 is through the official Image-Line website .