Not every iPad supports the newest version of iPadOS. Go to Settings > General > About to see your model name and check Apple’s official compatibility list.
How to Download and Install an iPad Software Update: A Complete Guide ipad download software update
This is usually a network error. Toggle your Wi-Fi off and on, or try a different network. Not every iPad supports the newest version of iPadOS
If your Wi-Fi is unstable or you don't have enough on-device storage, use a computer. Toggle your Wi-Fi off and on, or try a different network
Your iPad will check for available updates. If one is found, tap . Enter your passcode if prompted.
Updating your iPad is the best way to extend the life of your hardware. By staying current with iPadOS, you ensure that your device remains secure against modern threats and compatible with the latest apps in the App Store.