I bought FotoMagico 3 or 4 in the Mac AppStore, how do I upgrade to FotoMagico 5?

Hi i have buy the FotoMagico 4 from App Store , how I can upgrade to 5?

Went to Mac App store and purchased the version 5. I have version 4 but the version 5 app downloads from the cloud but I am unable to open. Have done several times. Still can’t fine Version 5 in apps and have paid. What do I do next?