I bought Adobe CS5.5 Design Standard. Acrobat Pro X is there included. But when I want to start it, it says that the serial number is invalid.  Like a test version which is finished. What do I have to do?

I bought Adobe CS5.5 Design Standard. Acrobat Pro X is there included. But when I want to start it, it says that the serial number is invalid.  Like a test version which is finished. What do I have to do?

Refer to this:
Sign in, activation, or connection errors | CS5.5 and later
Mylenium

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