iPad update installation failure
downloads but install fails
[Re-Titled by Moderator]
iPad mini 4, iPadOS 13
Question marked as
If your products list is correct, an iPad Mini 4th generation can support iPadOS 15.8.3, no further.
But your iPad seems to be running iPadOS 13 and, if the issue persists, I suggest that you try to update it via computer (if you don't have a computer borrow one from your friends/neighbors, or ask for help at an Apple Store or Authorized Service Provider), then learn how to update your device manually if you're using a Mac with macOS Catalina or later, or if you're using a Mac with macOS Mojave or earlier or a Windows PC.
If you still get no help, contact Apple Support directly, using this link:--> Contact Apple for support and service
Regards
Giulio