How can I download legacy software for an iPad 1?
If you bought/downloaded an app on one device and want to install it on device that has an earlier version of iOS, try these steps.

Here's how to find out if there's a compatible version of an app:


Open the App Store on your device.
Tap the Purchased tab.
Find the app and download it. If there's a compatible version, a message appears and you can choose Confirm to get the latest version of the app that works for your device. If there isn't a compatible version and you can't download the app, go to the app's product page and contact the developer for help.