The short of it is that we tested downloading 2.131 on an iPad 2 (iOS 9) when 2.140 released. So it works. The question is how to purchase it.
On downloading, check what the Internet says.
Here are some known workarounds:
- If you have another iOS device on the same App Store account that runs a modern version of iOS, that's easiest. Buy on the newer device, then download on the older device
- Otherwise, you need to gift it to yourself (confirmed by a user, this actually works!) or have someone to gift it to you.
And remember, blame Apple, not us. We just march to the advancing beat of Apple's drum.