Recently i've tried to download an APK file which was a modified version of YouTube but without ads but everytime i try to download it from the browser it doesnt do anything. I've tried to put the APK file in a USB stick and then plug the stick to the Smart TV and the thing is that the TV only reads media files inside that stick. All in all, ive tried to look up for the app store but i cant find anythig except for the tv default apps.

I would be grateful if someone could guide me on what do i need to do in order to download the APK file and to modify the youtube app in order to get rid of ads. Thank you!