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Hi, I am Justin. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
It is like that your iPad is to old to install the newer OS. If you can give me your serial from Settings -> General -> About I can confirm.
Please let me know if you need any help in this or would like to switch to Secure Remote Assistance for live technical assistance on your device.
This is a 3rd Gen iPad and it cannot be upgraded. I am sorry.