Chances are that the reason it’s not compatible is because of the Display resolution on your phone. This has been reported by a few Samsung customers in the past with apps not being compatible, not just ST. However if it isn’t showing when you search period, that is a blessing in disguise.
With that being said, DO NOT install the New App. It’s not ready and will only cause you problems if you start messing with it. It’s adds no value to you right now until it’s ready and they instruct people that they must convert over (this is months away at least).