I have 4, Roku 2 devices. I’ve read several articles that state Roku 2 can download YouTubeTV but I cannot find it in the list if available apps. Please help
There are five different Roku players that used the number 2 in its name, and I believe only one of them supports YTTV. What model number do you have? The fact that it isn't appearing in the Channel store is a likely indicator you don't have a supported model.
From the footnote at the bottom of the Roku Blog page announcing YouTube TV ( https://blog.roku.com/youtube-tv-is-now-available-on-roku-players-and-roku-tvs ):
Supported Roku devices include: all Roku TVs, Roku Ultra, Roku Streaming Stick+, Roku Streaming Stick (3800x, 3600x), Roku Express/Express+ (3910x, 3900x, 3710x, 3700x), Roku Premiere+, Roku Premiere, Roku 4, Roku 3 (4200x, 4230x), Roku 2 (4210x)
You can find your model number via Settings > System > About