iPad doesn’t support update – MathTango: Grades K-5 Learning Review

We love this app. It inspires my child who does not like math to do math. But lately this app no longer works because of updates. Is there a way that we can revert to an earlier version of math tango so my son can still play this fabulous game? So disappointed and hopeful that maybe there is some sort of solution?
Review by #Griffindorelove on MathTango: Grades K-5 Learning.