If you are like me, you hate the all white of default Sammy N because it's obnoxious and straining. I have figured out how to apply purchased themes to the N beta. I was not able to purchase new ones either. I would get an error, even if I had the links.
Go to the Galaxy Apps store and select Categories. At the top of that page there will be a themes banner. Click on that, then go to the three dots at the top. Hit "My Page" then "Purchased". Your themes should be there, and you'll be able to download and apply them.
*Added screenshots in second post. The full site corrupted the pics and the mobile app wouldn't let me add in an edit.*
Go to the Galaxy Apps store and select Categories. At the top of that page there will be a themes banner. Click on that, then go to the three dots at the top. Hit "My Page" then "Purchased". Your themes should be there, and you'll be able to download and apply them.
*Added screenshots in second post. The full site corrupted the pics and the mobile app wouldn't let me add in an edit.*
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