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We’re talking about an unofficial app that has been modified to allow premium features for free.

I’m fairly certain some pages were removed due to copyright. Someone published a download for FL Studio 21, and that got taken down, where people within request posts were telling others to find it elsewhere.

This is their official documentation

On the bottom under manual configuration they tell you how to configure it on Linux.

Though personally I ended up opting for AirVPN only because I didn’t want to mess around with scripts to keep proton’s ports from expiring.