Problems with updating the Ipad.
I can't update the ipad from version 9.3.2 to 9.3.6. I click on the install button and there is an endless download.
iPad (3rd gen) Wi-Fi + Cellular
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If you are experiencing difficulties with updating your iPad, these support pages may be helpful:
Update your iPhone, iPad or iPod touch – Apple Support
If you can't update or restore your iPhone, iPad or iPod touch – Apple Support
If your iPhone, iPad or iPod touch won’t update - Apple Support
If you see an error when you update or restore your iPhone, iPad, or iPod - Apple Support
iOS update and restore errors – Apple Support
Obviously your iPad is limited in its ability to update - the final supported version for your iPad being iOS 9.3.5 (WiFi Only) and iOS 9.3.6 (WiFi+Cellular).
If you continue to have difficulty, you might have more success by updating your iPad directly from a PC (with iTunes installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of macOS).
Update software on iPhone, iPad or iPod touch in iTunes on PC - Apple Support