My iPad Pro 11 have a software update but won’t install

If the iPadOS software update has apparently downloaded, but will not install, it may have been corrupted. If so, it will be necessary to delete the download prior to making further attempts to update your iPad.

To delete the failed update:

Settings > General > iPad Storage - scroll down the list of Apps until your find the iPadOS update, touch, then select Delete App.

Once the failed update has been deleted, you can retry the update process:

Settings > General > Software Update

I hope this proves to be helpful in resolving your software update problem.

Hey there!

Would you mind giving a screenshot of what happens when you try to install iPadOS?

There are some steps over at Update your iPhone, iPad or iPod touch – Apple Support which may be of some help to you.

Hello,

Please refer to the following Apple Support document.

If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support

Screenshot and more info please