As discovered by @tvsutton and reported on ##osx-server IRC, the Mac App Store version of Garageband’s assets (which are downloaded on first-launch, all 1.57GBs…) can be fetched in advance:
This makes it easier to deploy, since it is a standard package for content found outside of the .app bundle itself. The packet sniffing tool Wireshark was employed to find this, and through this and further investigation of the App binary, two more things of note were found:
• The GarageBand lesson store(notice the country localization in the URL)
• and this compatibility update.
Allister has had the honor of writing a book with Charles Edge (http://url.aru-b.com/packtbook), an article or two for MacTech Magazine, and speaking at conferences like MacAdmins Conference at Penn State. He lives in NYC, contributes to various open source projects, and speaks enough Japanese to order food.