How can I upgrade my movies to 4K/
I just saw a sale on Harry Potter 4K movies. When I got the movies from codes a long time ago, the movies were in HD.
When I try to purchase them in 4k, iTunes won't let me. I just see the Play/Download button and I can't even get access to the features available in 4k. How do I resolve this? I hope this makes sense.
MacBook Pro (15-inch, 2018), iOS 12.1