You can how to download cydia on iPad (iPad Air 2, iPad Air , iPad Mini 3, iPad Mini 2, iPad Mini, iPad 4, iPad 3, iPad 2, iPad) and any iOS version (iOS 8……iOS 7….iOS 6….iOS 5……..iOS 4…..), before download cydia for your iPad you have to jailbreak iOS devices and you can use these tool there are TaiG, Pangu, PP jailbreak, P0sixspwn, Redsn0w. it will take few time to jailbreak using this tool without any issues.
Guide to step by step how to download cydia for iPad
You have to get Bagkup your iPad before install cydia using iTunes or iCloud.
Go to Settings >>> Wifi >>> Connect your iPad to your PC or Mac using USB.
Download and install an SSH to your PC or Mac, open SSH WinSCP, Core or Filezilla as for Mac user, you may go for Cyberduck, open Cyberduck and connect it with iPad
Download the latest Cydia and download DEB file suitable to iPad version
Now start an SSH comment line (Ctrl + T for Windows users) GO >>> Send Command.
Run this command to install cydia on iPad
Now you can see cydia icon on the home screen of your idevices.