How do I make the update
How do I make the update and download apps it doesn’t let me
iPad, iPadOS 13
What update? IOS update? If not that, more information would help.
Get help with over-the-air iOS updates
Update – Can’t or can’t restore
Have you tried using iTunes on a computer or Finder if running Catalina to do the update?
Update software on iOS devices in iTunes on Mac
If you see an error when you update or restore your iPhone, iPad, or iPod