You have to sideload it with Aptiode, or at least that is the way I did it. You have to go to settings, device, developer, APPS, and turn on "apps from unknown sources", then use Chrome or Firefox to download Aptoide.
I have latest version of IPTV Smarters Pro with a Himedia Q10 Pro android box with inserable internal hard drive. I also have it on Firestick 4K. When I select a channel it goes fullscreen. After a while it kicks back to the EPG with a screen box in the upper right hand corner of what I am...