Pixelmap Builder Premium works on 2 Windows computers, whether you bought it on Windows (license key), iPhone, iPad, Mac or Android (sign in with your Pixelmap account). Here you can see them and remove one to use Premium on another.
A removed computer goes back to the free version the next time it is online. To use the license on a new computer, open Pixelmap Builder there and enter your key (GET PREMIUM) or sign in (MY ACCOUNT). Help: pixelmapbuilder@gmail.com