How find serial number of previous Lightroom version, just entered when activating LR 4 weeks ago?

I have bought Lightroom 1, and the upgraded to 2, 3 and finally 4.
I have all serials, beside 3, I can not find it anymore.
I had it some weeks ago when re-installing LR 4 on formatted hard-drive.
How can I get it back?
Thanks for help,
Robert

In Lightroom, click on Help>Lightroom Registration. This will likely show this dialog box:
Click on the "Back" button and Lightroom will then display BOTH the current (LR4) serial number AND the previous version (LR3) serial number.

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