Tablet Requirements To Run Mobile App

So what do Samsung tablets have that both of my other tablets are missing and keeps them from running the mobile app?
I have an old (2012) Samsung Tab2 GT-P5113 running Android 4.2.2 that runs the app beautifully.
But I have a basically new (2015) RCA Pro 10 Edition 2 tablet running Android 5.0 Lollipop that won't even install the app. Not from Google Play store nor from Reolink website.
I also have a newer Nextbook NX008HD8G (2015) 8" tablet running Android 4.1.1 that will not install the Reolink mobile app. as well. Both tablets give the error "no qualifying devices found" or "Your device isn't compatible with this version"
Why won't Reolink let me download the Android mobile app with my desktop computer, put the app on an SD card, and try to install on my tablets that way? When I click on the app with a desktop PC the only option is to install, no option to just download the app and transfer it to a SD card.
So SOL with these two tablets? I'd like to get a 7 or 8 inch tablet for demo and remote administration. Anybody running the mobile app successfully on a smaller tablet care to jot down the brand and model here? Thanks

Hi reolink203,

We have got your feedback and sent to our engineer to check any possibility and offer any solution that we could.
Sorry for any inconvenience here.

Thank You very much.

I'm pretty sure there is a solution because I had the exact same problem with a system from another manufacturer. The Reolink system is far
better and easier to install and use than their system even though they have wireless PTZ cameras. Again, thanks for any help in getting the mobile client to work.

Hi Reolink203,

Thanks for your kind support and understanding. We will update you if any solution is available. Hope we can manage it.

Hi Reolink203,

Are the 2 tablets not able to install the APP. without camera?

Hello,
Both tablets have two cameras....one forward facing and one rear facing.

Hi reolink203,

Please send an email to support@reolink.com and we will send you the Android app. directly to install and try. Thanks.

I received the app you sent and emailed it to the RCA tablet and it is up an running!
Thank You very much for sending it. Very Happy!