can't download iPhoto upgrade
The App store shows me that there's an upgrade to iPhoto that I should download. Indeed, when I try to open the .dmg file of this upgrade that I downloaded from the Apple website, it tells me that I have to upgrade via the App store. So I go to the App store, click on "download" and it tells me to sign in to the account that I used to buy iPhoto. But that's not possible, because it came pre-loaded on the MacBook Pro I use and have used for about 4 years.
So I anyway sign in with my current Apple / iTunes /App store ID. Go back to download iPhoto, and get the same message to sign in. Try again to sign in, although the App Store menu shows that I'm signed in. Go back to download, same message. Kafka lives!
How do I get this upgrade?
Thank you
MacBook Pro, Mac OS X (10.7.5)