About a year ago i purchased 3 themes and have used them regularly. I tried to apply one tonight gave me a error message and when clicking on the theme it shows i need to purchase the app again. Dont know whats happened
Make sure you used the same ID you used when you purchased it.
I had a different ID when I first signed up with Samsung, bought a few themes, then changed my ID. Now when I switch phones I have to use the original ID to install those themes.
I asked Samsung why I can't download the themes to with my new ID if I show the the receipt, they said they will recommend that to the developers, but I'm sure nothing will be done.