I gave up. I was able to put Prime on it but the satellite internet sucks bad enough here that I'm lucky to get 5+ minutes of viewing before it pauses to spool up for 2-20 seconds.
Hell, even the built in Samsung TV Plus app doesn't work with our lake internet situation. The channels and programs show on the guide but none of them tune in. Worked fine on that TV when it was in CLT. I've updated the system, reset the system, updated again. Turns out I really don't care.
Johnny might have hit on something regarding cable packages and app success. BUT... I was able to install and watch the History Channel app for a couple hours at the lake, before it quit, by using my Charlotte Spectrum account ID, though I'm unable to do so at the house in Charlotte where that account actually is. Probably because I don't have a cable package that includes History Channel...but why would I have gotten it, even briefly, at the lake house???
The Motu Leaf OTA continues to give me 20-40 channels, depending on weather, just by hanging on the wall behind the TV. It gives me the Olympics, Magnum PI, Quincy, and Tales of Wells Fargo channels...so I'm pretty good with that. I'll try mounting it outdoors in the proper direction one day when I get the gumption.