When you purchase a movie on Amazon (distinct from streaming it for "free" with a Prime membership), it is yours to keep in your digital library. You can download purchased titles to watch offline, but they must be viewed through the Prime Video app due to digital rights management (DRM). How to Buy and Download
Tap the (usually a downward arrow) on the title's detail page. Key Restrictions & Rules Amazon Prime Video Usage Rules can i buy and download movies from amazon
Windows 10/11 and macOS via the official Prime Video app . You cannot download movies directly from a web browser. The Download Process: Open the Prime Video app on your device. Navigate to your purchased movie. When you purchase a movie on Amazon (distinct