Downloaded serial number no longer works for LR4

I downloaded LR4 4 years ago and when I recently tried to run, the program request for a serial number, so I entered the most recent code, but it has not been accepted and said that I had to use the previous code of the original purchase, which I did more.  How to get this code or find a workaround?

Please check error: "this serial number is not for a product calling it" | CS6 cs5, CS5.5,

Concerning

Hervé Khare

Tags: Adobe

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