Let's get a few things clear.
1. Your Ubee is a GATEWAY - it's a combo modem/router. It both connects to the internet and distributes the internet signal both via Ethernet (which you're using) and Wi-fi, which it appears you are not using. BUT whether you're using it or not, it's definitely there. It may be turned off - depends if the technician installed it or not. Generally it's on by default, but I can't speak to what may or may not have been done.
Jon, log into the router using the instructions here:
https://d15yx0mnc9teae.cloudfront.net/sites/default/files/ubee-dvw32cb-userguide.pdf (from Spectrum's own site)
I have NEVER heard of a router/gateway that required an app. Never, ever and I've dealt with a LOT of routers, modems and gateways in my time. They always use an IP address with an interface/administration page, in my experience - and that is EXACTLY what they describe in the user manual. (I think you may be getting a bit confused, as they talk about the internal software on the gateway in the manual - but it's already ON the gateway, not some app you download - and it's accessible from the IP address I list here)
The IP address you need to go to is:
http://192.168.100.1
Login Default ValueStandard User Web Interface Login Username: admin
Password: <random password>
(The random password can be found on the device label, referred to as “GUI
password”) The label will be on the bottom of the router - get your reading glasses, it's typically in microscopic type.
Anyway - let us know if you've tried the basics for accessing it by following the directions in the manual starting on page 10 (which explains the label, where you'll find the login PW). There should be no need for a technician here - the instructions are very clear.
Let us know how you do. Then we'll figure out the next steps, which in order to connect a "dumb" tv, will likely involve an AppleTV or Roku. BTW - the AppleTV is stupid simple to set up and comes preloaded with stuff like Netflix, if I recall. Obviously you need to have a subscription for the paid streaming services but once logged in, it's generally very painless. I suspect the Roku isn't much different, but I've never used one.