Did you manage to find the app?
I just looked in apps and noticed it there
For the search function its on the top right hand corner of the screen.
I am running Tizen 5.0
Why not keep the current set up and add plex software to the mix. I use plex on my PS3 to the projector in my bedroom and the lounge has a smart TV, it plays everything I throw at it. You can rip your moives to a file and play it off that.
Stay away from these people they have no idea what they are doing and my TV came back in a worse condition than it went in, Had to get Samsung to intervene and change the repairer.