iPad Mini update to iOS 8.4 will not validate and update?

On my iPad Mini, the update iOS 8.4 is downloaded, but on attempting to validate, fails with error "no longer connected to Internet", notwithstanding that the device is clearly connected to the Internet via Wi-Fi! After several re-tries, even when connected to the Internet via several different Wi-Fi devices, the situation persists.
Any advice on what is happening, and how to correct the situation?
Appreciatively, Arbyem
R_Bruce_MorrisColonel (Retired)Asked:
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JohnBusiness Consultant (Owner)Commented:
How old is the iPAD?   Install iTunes, hook up the iPAD to iTunes and install IOS that way.
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R_Bruce_MorrisColonel (Retired)Author Commented:
The iPad Mini (Model ME276C/A) is just two years old. iTunes is not installed. However, from the App Store, there does not appear to be a way to download the iTunes app. I am obviously missing something.
BTW, any idea why the usual install process does not work, given that the update has already been downloaded automatically, and the Wi-Fi connections, both here and at other locations where the completion of the update process has been attempted, have been operating?
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JohnBusiness Consultant (Owner)Commented:
Downloading IOS over Wi-Fi needs a near perfect connection. Any dropout can cause it to stop. Even using iTunes, I have had to restart the IOS download.
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Kyle SantosCustomer RelationsCommented:
Were you able to get the iPad updated to the latest iOS?
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R_Bruce_MorrisColonel (Retired)Author Commented:
Not yet! I do not know any alternative connection to the Internet. Besides, I still do not have the iTunes app on the iPad Mini. Any other possible approaches?
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Kyle SantosCustomer RelationsCommented:
Yes.

John said
Install iTunes, hook up the iPAD to iTunes and install IOS that way.

What I believe he meant was to go to your computer (desktop/laptop) and install iTunes on there, open iTunes, plug in your device via USB to your computer, and follow the 'update' prompts that iTunes gives you to update to the latest iOS for your iPad.

Sources
Update iOS on your device - https://support.apple.com/en-us/HT204204
Backup your device on iCloud or iTunes - https://support.apple.com/en-us/HT203977
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R_Bruce_MorrisColonel (Retired)Author Commented:
Hi Kyle:
Thanks for the expeditious clarifications! I connected the iPad Mini to my MacBook Pro Mid-2012 under Yosemite, and with a Wi-Fi connection. The download and installation of iOS 10.1 was successful (obviously bypassing iOS 8.4). I completed the operation without reference to your hot-link provided.
I will close this question and award points accordingly.
Appreciatively, Bruce
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Kyle SantosCustomer RelationsCommented:
I am glad to hear we were able to help!  Make sure you make backups of your important stuff on your iPad :)

Take care.
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R_Bruce_MorrisColonel (Retired)Author Commented:
Thanks to John and Kyle for resolving my issue quickly and completely, although I do not understand why only the iOS 8.4 update had been downloaded originally, while the connection to the Internet via my MacBook Pro appeared to override the iOS 8.4 update which had already been downloaded, but could not be validated for installation.
Appreciatively, Bruce
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