Your download of MPK3 Settings is starting

Starting in 3…

From flathub.org — the developer's official site. Flatnic doesn't host, re-package or modify files.

How to install MPK3 Settings

Click Download — the developer's official website opens in a new tab.
Download the latest version there and run it. Choose Custom/Advanced where offered, and skip any bundled extras.
Prefer the command line? With Flatpak you can install and update it with: flatpak install flathub io.github.tsmetana.mpk3-settings
Open MPK3 Settings once it finishes installing.