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A trial version of the CS5.5 is not available on adobe.com. A CS5.5 license will not work on CS6. To use CS6 you'll need to upgrade.
If you purcased CS5.5 as n electronic download, you can download the installer again from "My Account" page on adobe.com. Sign-in with your AdobeID to access the page.
Thanks you for your reply, but as I know it was already an upgrade.
I don't have any CD... Maybe
Unfortunately I have nothing on "My Account".
It worked !
Many thanks !