Sign first into the AppStore with the AppleID you used to buy or to accept GarageBand, and then use the "download later" button. That should send the package to the AppStore.
The download may not succeed due to several reasons. For several people several different fixes worked (resetting security questions, reinstalling, trashing preferences), see my post here
and look at the link at the bottom to Dagon's post on reinstalling.
Iv tried everything and nothing seems to be working...i dont know if maybe im not fully uninstalling it right or what im doing wrong but nothing is working. iv signed in and out of my account several times, i cant seem to see the iLife i dont know if maybe i already have it or what but i see that nowhere in my purchases. if i click download latr and then go to the app store to the updates theres still nothing there.
Did iLife come preinstalled? Then you need to accept them to your user iD.
- Double-click the App Store icon in the dock.
- Enter your Apple ID and password.
- Click Purchases.
- If you haven't previously accepted your bundled iLife applications within the Mac App Store, you should see your iLife applications appear in the Accept portion of the screen. Click Accept.
- You may be asked for your Apple ID and password once again. Your iLife applications now move to the Purchased section. These applications are part of the software that came with your Lion based computer. Your account will not be charged for them. Click Install to complete installation of your applications.
You may not be able to "Accept" or not see them if a previous owner of your Mac already accepted them, or if you are using a different AppleID.