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Acrobat 9 (from CS4) asking for serial again after OS-upgrade to Yosemite. New installation not possible

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Hi all, I feel quite desperate at the moment.
My old CS4 ran perfectly. Now I upgraded my system to Mac OS Yosemite and the trouble began.
First, Acrobat no longer ran properly and asked me to start e.g. Photoshop. What I did. Photoshop and all other CS4 applications no more worked beause of some license issues. I finally fixed this by means of Adobe's tool. I had to re-enter the CS4-Serial and Photoshop, Indesign etc. worked again. Not did Acrobat Pro 9. This application asked me to re-enter the serial. What I did. The serial was not accepted. I tried a thousand times. Then I uninstalled Acrobad Pro 9 and tried to re-install this application from the original CD. This does not work: The setup screen of my CS4 "Design Premium" stopped three times with the grey screen reading "Preparing to install". Other attempts ended up in error messages about JAVA etc. - The DVD simply does not work anymore with the new OS.
Can anyone tell me what to do? My search over Adobe's support pages never led me to a valid contact form or anything of use for this problem. 
Thank you in Advance

Answers

A point worth pointing out is that, although CS versions may have included installers for Acrobat they were not for direct use; often (who can remember CS4?) you MUST use the CS installer, which uses the Acrobat installer in a special way; CS licensing is not like Acrobat licensing and Acrobat does not take a CS number. Nevertheless, I'd still advise a restore and not upgrading your OS without being prepared to upgrade everything else. (And it's still very early, this is a very brave/risky thing even for CC licensees).

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