My IPad says it is updated to 16.5 however I’m still getting a very frequent pop up saying”unable to install update an error occurred installing software” how do I get rid of this pop up?

If your iPad is not behaving as expected after performing a system software update, a forced-restart is recommended:

Force restart iPad (models with Face ID or with Touch ID in the top button)

If your iPad doesn’t have the Home button, do the following:

1. Press and quickly release the volume button nearest to the top button.
2. Press and quickly release the volume button farthest from the top button.
3. Press and hold the top button.
4. When the Apple logo appears, release the top button.

Force restart iPad (models with the Home button)

Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.