Upgrade to Permute 3
Permute 3 is the next major release of Permute. It is a paid upgrade with upgrade pricing and other details described here.
The steps on how to upgrade depend on where did you purchase Permute.
If you are not sure where did you purchase it, select Permute > About Permute in the menu bar.
If it says it's an App Store version, it was purchased on the App Store, if it says "Licensed to ...", it's a direct license version.
If it says Setapp version, you're getting the upgrade for free via Setapp and you don't need to worry about anything.
You may alternatively try Setapp - the only subscription service for macOS apps - get over 100 apps including Downie 3 and Permute 3 for a fixed monthly fee with no upgrade fees - ever! Enjoy one month free trial.