Just paid for and downloaded your app (looks great, by the way!), and I got the message "This app can't run on your PC". I don't usually have this problem - Windows 10 desktop - so I'm wondering what to do next...?
You probably already know this, but if you don't, lospec.com has a great collection of 4-colour (and many other) palettes... https://lospec.com/palette-list