It is up to each developer to choose the specific BB model numbers / major OS level combinations that they will support. Further, with BB10, it's not a matter of them porting their app from BBOS to BB10...they have to start from scratch. So, not all developers choose to support everything.
But, in any event, the best place to make your inquiry is with the app developer, for it is their responsibility.
Occam's Razor nearly always applies when troubleshooting technology issues!
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