Not sure you can use a redemption code for LR 5 anymore. LR 5 stopped being sold over a year ago.
Google "Redeem serial number for Lightroom 5 with redemption code" and see what comes up.
Thanks, but late last night I was able to get it -- apparently there was a
work order on the site that was going on. Luckily I was able to download it
In a message dated 10/9/2016 4:38:40 P.M. Mountain Daylight Time,
serial help woota woota
created by Just Shoot Me (https://forums.adobe.com/people/JustShootMe)
in Photoshop Lightroom - View the full discussion