My OS is in English but I'm used to use the Adobe suite in French, so I bought the french version.
While installing all was OK, the serial number worked.
Illustrator, Indesign and Photoshop work perfectly.
But when I try to launch Acrobat, it askes me for the serial number. It somehow automatically detects North America while I'm in Europe. And my serial number doesn't work (This serial number is not valid for your product).
I tryed to change the system language to French and Acrobat worked correctly without asking for the serial.
Back to English, it asks me for the serial...
Does anybody have an idea of how to solve issue?? I really hate having my OS in French...
I got the answer somwhere else, so I copy here the link if it may be helpfull for someone: http://hints.macworld.com/article.php?story=20110522014935224