Why I can't open my Aperture 3?

Last Friday I bought online aperture 3, but can't be opened on my iMac. I have all the requirements needed to do it. How can I try to download it again if doesn't appear in my iTunes?  It apperars that I bought it I have even the invoice number but not the software.

If I have to reinstall my system do all my stuff will be safe, I mean, all my files, photos and videos?
The installation should only change the system files, not your home folder, but in any case, please do not do a reinstall before you have made a working backup of your system.
The article that you suggested to read asks  to Update to the OS X v10.6.7 combo  but I already have the Mac OS X v10.8.8.
Then you are running a prerelease beta version version of Mountain Lion and and are bound by a non-disclosure agreement, that forbids to post any information in a public forum. Please ask in the MacOS Developer Forum open only to Developers.
but I'm just an old lady who doesn't knnow much about computers
Then it is really hard to believe that your system is a developer beta version - are you really sure it is not 10.6.8? Then don't reinstall 10.8.8 but downgrade to 10.7.3. (or 10.6.8.)
As an unexperienced user without a background in system developement you would be far better of with MacOS 10.6.8 or 10.7.3. Those are stable releases that would give you far less trouble .
Regards
Léonie

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