I want to download iBooks Author on our iMac (which has OS 10.6.8) and the download says that OS 10.7.4 or later is required. When I click to update, I'm told there are no updates available. Help?

I want to download iBooks Author on our school iMac (which has OS 10.6.8) and the download says that OS 10.7.4 or later is required. When I click to update, I'm told there are no updates available. Any suggestionss - Help?
/Suzanne

Welcome to the Apple Support Communities
That's because OS X Lion is a paid upgrade. The most recent OS X version is Mountain Lion, so I recommend you to upgrade to this version.
First, make sure that your Mac is supported > http://www.apple.com/osx/specs If your Mac is supported, open App Store and purchase Mountain Lion. While Mountain Lion is downloading, you can make a backup of your files, so you won't lose them if the upgrade fails.
When the download finishes, the installer will show up, so follow the steps to upgrade OS X. It will upgrade OS X to 10.8.2, so you will be able to install iBooks Author and a lot of apps from the App Store. Check if your applications are supported > http://www.roaringapps.com

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