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If you continue to experience difficulties with direct update from iPad Settings, you may have more success if you perform the update using a PC or Mac computer. IOS update and restore errors – Apple Support If your iPhone, iPad or iPod touch won’t update - Apple Support If you can't update or restore your iPhone, iPad or iPod touch – Apple Support
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Update your iPhone, iPad or iPod touch – Apple Support If your iPad is capable of being updated to a more recent version of iOS/iPadOS than is currently installed, these support pages outline both the available methods by which the update can be performed - and troubleshooting should you experience difficulties: I’ve tried to install the new iOS 15.2 update on my iPad and I keep getting a message it’s having trouble installing… anyone have any advice?
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