This website is not manned by Adobe employees. We are all users trying to help each other. A redemption code is not a serial number. As serial number has six groups of four numbers, and the first four are always 1160. The redemption code that you have should have instructions on how to redeem that code to obtain a serial number. Additionally, here is a document that might be of help to you:
If you have a Redemption code you have to submit this to Adobe and they will supply you with the Serial number to enter in your installed copy of Lightroom. See the link below for assistance.