The Guitar Hero DLC is compatible with each game. I bought DLC on Band Hero and it worked on GH5 and Warriors of Rock. In my Wii's game data, it appears as World Tour DLC, and I don't even own that game.
Besides, it's an issue with installing the wad. I have the same problem and have not yet...
Caller -"Everytime I start a Pc game on my S24, playing on a external monitor, someone calls or texts me, n it kicks me out of the game." Customer Support - Click (hangs up)
I found it funny cause many many years ago, had a roommate in college that did this same dumbass branding of the school logo, but it didn't look anything like it after it healed. Just looked like a birthmark.