After using CS6 for a year, I suddenly get a message that my serial is invalid.

In November 2013 I purchased the Adobe CS6 Master Collection for educational purposes. After using it for a year without any problems I suddenly got the message that my serial is invalid.
I already checked the host file, uninstalled the update manager and tried installing the software on a clean computer with the original DVD. Since I'm unable to contact costumer service by phone (finally hung up after 2 hours of waiting) and since the online chat is unavailable, I'll try it via the forums. Please help me.

Hi Markus, thanks for your post.
I tried what you suggested, but it failed. I first got a massage that deleting was failed, then I tried using the cleaning tool. At first the tool found something, what I deleted, but it came back. I restarted several times, closed all browsers, etc. Now the cleaning tools won't find anything but it still didn't solve the problem.
The only thing I didn't do was:
In a text editor, such as TextEdit, open /Users/[user name]/Adobe Creative Cloud Cleaner Tool.log.
Review the log file entries. If any of the entries indicate failure, contact us. 
I tried, but couldn't find the file...
Elly

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