I am having a similar problem.
A friend used my phone to install an app from the samsung store. Now when I want to install the app it says view in gear manager instead of giving me the option to install on my gear 2. There seems to be no way to make the samsung store think it is uninstalled. I have fully reset my gear 2, phone, deleted my samsung account and made a new one, no change at all.
Super annoying. 5$ to anyone with a fix.