do i need the xbox app if i have the box Console Companion on my computer?

It's ultimately up to you depending on what you're wanting to use it for. I have both installed on mine.

The console companion app has been discontinued so any new features will only be added to the Xbox app.

so the answer is yes i need to add the xbox app to my computer?

The console companion app has been discontinued so any new features will only be added to the Xbox app.

You could also use the console companion app to download your videos to your computer, that's what I do... here is a link to the app.

https://www.xbox.com/en-US/console-companion-app

I have Windows 10 on my computer, my console is up to date, my Companion App is up to date, and everything is connected, yet it also says either one needs an update.