You can use "Coojis" (Koji templates) to upload MP4 files and set a price for your audience to purchase and download. 2. Legal Streaming & Movies ("KOJ" / KKHH)

Both platforms host the film and allow users with active subscriptions to download for offline viewing within their respective apps.

If you are looking for software to download videos from the web, several "MP4 Downloader" apps exist, particularly on Android. Download a file - Android - Google Chrome Help