Launch the App Store and sign into your account. Goto the "Purchases" tab. There the iLife apps should be waiting for you to be accepted.
- 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.
See this Support article, the section on:
I went in to the purchases section however the iLife apps are not there. Maybe I have previously accepted them when I first bought my computer. I am being advised there are updates available but when I try it is telling me to sign in with the account that purchased them. How do I check that these things are linked.