Cannot download the rest of the loops/instruments

Question

I am trying to download all the optional instruments in garage band and I get the message:
"The Software Instrument or Apple Loop selected is currently being installed.
You have already ignited the installation of additional content for GarageBand via Software Update.  For additional information please open the "Software Update" application."
However when I look at software update all I see is "No Updates Available".  How do I get the rest of the instruments?

Answer 1

Is this a new mac and did GarageBand come preinstalled? Or did you migrate from a different Mac? There may be many reasons for this problem, check the possible causes:
Check, if GarageBand is installed in the "Applications" folder and named GarageBand. Otherwise you cannot update it.
Have you accepted  a preinstalled GarageBand to your AppleID? Sign into to AppStore and check the Purchase Tab. Accept, if necessary.
GarageBand may already have downloaded the loops, but not indexed them. Then you could try to rebuild the Loop Index: Rebuilding the Loop Index in GarageBand
GarageBand may not be able to remember that it updated, because of corrupted preferences, then try HangTime's "oddball" problems fix and delete the preferences:
http://www.bulletsandbones.com/GB/GBFAQ.html#oddballprobs
Remember, in Mt. Lion the user library is hidden; you open it best from the Finder's "Go" menu, from the main menu bar:
     Go  > Go to folder           then hold down the alt/option key until the library appears in the drop down menu. Select it to open and remove the file Preferences/com.apple.garageband.plist
If all fails, try to reinstall GarageBand - move the application to the Trash and download it again from the AppStore.
. Re: GarageBand '11 won't download additional loops
Regards
Léonie