I run iOS 8 on my iPad 2 (downgraded from iOS 9, which made it super slow). Unfortunately, Apple doesn't let you download old versions of apps unless you instal

I run iOS 8 on my iPad 2 (downgraded from iOS 9, which made it super slow). Unfortunately, Apple doesn't let you download old versions of apps unless you installed them at the time, so the device usage is restricted to "what I used the device for then", which hinders a lot.