Not able to open this new app to update – StepBet: Walk, Get Active, Win Review

I have completed 4 week of The challenge. I cannot Open app at this time to update. I have 15684 as of 8:31 on 6/10/18. I don’t want to have wasted my time and money and get kicked out of the challenge because of this new update.
Review by Brenda711 on StepBet: Walk, Get Active, Win.