FL Studio 20 was the latest version released by Image-Line, the company behind FL Studio. There might have been subsequent versions released since then, but I don't have information on FL Studio 21 or any versions beyond FL Studio 20.

FL Studio is a digital audio workstation (DAW) software used for music production, recording, editing, and mixing. It's known for its intuitive interface, extensive features, and wide range of plugins and virtual instruments. FL Studio is available for Windows and macOS platforms.

If FL Studio 21 has been released, you may want to check the official Image-Line website or trusted software distribution platforms for more information about its features, updates, and availability.