You can download the same title as many times as you want on up to 10 devices, provided you have storage space available on your individual device. And, downloads will stay in your DOWNLOADS for as long as you remain a subscriber, so long as you connect your Disney+-compatible device with the download to the Internet at least once every 30 days.
Rarely, some titles are removed from Disney+ for streaming and download, due to rights restrictions. If this occurs, impacted titles will also be removed from any previously Downloaded content you may have.
Go ahead. Download your favorite movie or show and relive it again!