It sounds like you're looking for a way to download Guitar Hero Live or Rock Band 2 — but just a quick heads-up: full game downloads for those titles aren’t legally available as free normal downloads.
That said, if you’re putting together a social media post or forum request, here’s a clean example: Guitar Hero Live Rock Band 2 -Normal Download L...
I know Rock Band 2 had a store download back in the day, and Guitar Hero Live had GHTV, but servers are gone now. Are there still official ways to get them? It sounds like you're looking for a way