Since the Moviebox Pro app is not available on the Amazon app store, you need to use the sideload method to install the Moviebox app on your Firestick.
How to Install Moviebox on Firestick
Open the Downloader app on Firestick.
Wait for the app to download.
Click Next to continue.
Click Install to start the installation.
How do we download movies?
Download videos
Make sure your device is connected to the internet.
Open Google Play Movies & TV .
Tap Library.
Find the movie or TV episode you want to download.
Tap Download .
How do you change the quality of Moviebox pro?
How do you get movie box on Android? – Related Questions
Under Data usage per screen, tap Medium or High, then Save.
Does movies anywhere upgrade to 4K?
There are two options to upgrade movies to 4K UHD: Redeem a 4K UHD Digital Copy code in Movies Anywhere. If you had already owned the movie in a lower resolution/format, you will need to repurchase the 4K UHD format of the movie. This option is only available on select Digital Retailers.