Before we discuss the how, let’s address the elephant in the Batcave. Searching for a free download of a copyrighted movie like The Dark Knight Returns Part 1 often leads to:

The good news? You can legally download and “install” (transfer/save) this movie permanently for a small price. Think of it as buying a digital license that you own.

Even after downloading, you might face problems. Here’s how to fix them.

By default, Amazon encrypts the file so only their app can play it. You cannot simply copy the file to a USB drive. To truly “install” it for offline viewing within the app, you’re done.

However, if you want a standalone MP4: