To install or update the App Store Edition:
Open the App Store app.
Choose App Store menu option Store > Sign In.
Sign in with the same Apple ID you used to purchase iStudio Publisher.
Choose menu option Store > View My Account (macOS Mojave or later), or menu option Store > Purchases (earlier versions of macOS or OS X).
Click the button/icon next to each app to install, update, or open the app. Doing this from the same Apple ID and App Store country as the original purchase will not charge your account again.