Ok.
Since 2015 the Droidbox T8 home page/launcher screen looked like this
https://droidbox.co.uk/how-to/t8-and-t8-s-launcher-home-screen/
I think prior to that, there was a tile marked "my apps".
I have seen the 9 button tile on machines supplied by other companies e.g. Droidsticks.
At any rate that should not make any difference.
Let's recap:
1. You downloaded the mft installer successfully from the ares project forum
2. You can access it via the apps button on your Home page
3. You see a screen with tabs marked Recommended, movies/tv, live tv, music, other apps. The default open page is Recommended
Ok so as a trial, I am going to download the Terrarium TV app (I suggest you try this experiment as well).
1. I go to the tab marked movies/tv
2. I scroll down to Terrarium TV
3. I position the cursor on the download arrow on the right of the screen
4. I press download and an advert pops up to which I press "no thanks".
**Is this the screen you are stuck on with the "red button" or whatever?
You need to exit out of it by whatever means either by hitting "no thanks" or possibly a window close control like an "x" in a corner of the screen. I can't predict what sort of pop up advert has been shown or the screen closure controls.
5. It returns me to the download screen and immediately a box pops up asking me if I want to cancel or Install the app. I select install.
6. The app installs and asks me if I'm done or want to open it.
7. I select open and I'm in Terrarium Tv.
8. It advises me there is an update which I select
9. It returns me to the MFT installer - another advert pops up which I say "no thanks" to
10. I go to my apps and open terrarium tv.
11. Done