Invalid serial number message

Adobe Acrobat Standard XI has been installed on my Dell computer when I bought it 2.5 years ago. Suddenly he began to ask me a serial number when I try to open it. I enter the number on the cover of the disc that was shipped with the computer, but it gives me a message "invalid number." How can I access the software I purchased?

Thank you.  It worked in the end, but not exactly as you described.  The sign-in link in your message did not work, so I went to adobe.com.  Signature here gives me the options you mentioned, so I searched «see your product»  The first element includes the instructions to go to accounts.adobe.com and it connect.  In this page, I was able to follow the rest of your instructions and get my correct series number.  Not sure why it's different from what installed Dell there is 2.5 years or why after all this time it suddenly began to pose for him.  But at least I can now get into my software.  Thanks again.

Tags: Acrobat

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