As of March 2018, having same issue. I had previously used GA4 on an old DELL, and all drum pack content installed properly.
Then, I bought a new DELL, loaded a fresh GA4 download from the Steinberg web site, and it installed with “zero” drum packs. All “Beat”, Acoustic" and "Percussion Agents are missing, (except Jazz Essentials, which I bought separate and installed afterwards). If it matters, Jazz Essentials does work, and are the only drum sets available to “LOAD”.
I am on PC, so unfortunately the Apple/Mac directions listed for “GA4 Missing Drum Packs” by Josh Matlock, for a “Brin”, do not apply.
I have looked at uninstalling the GA4, but find soooooo many “Steinberg” folders, that it’s hard for me to know which to uninstall, and which are essential to my Artist 9. I am afraid to uninstall the wrong things, so I could do a clean re-install! Which folders are GA4, and which are not???
As mentioned, I am using Artist 9 version 9.0.40, and have GA4 with the 4.2.40.322 update.
Help! I’m dead in the water!