What computer operating system will you be using for Premiere Elements 12? Just background information for now.
Were you given instructions from the seller with regard to getting a serial number when you start with a redemption code?
If you have been following them and those instructions are not working for you, then please review the Adobe document on
using redemption codes
If the information in that document does not help, then scroll down the document to find the link to Adobe Chat. Adobe Chat
is the best one to assist you at that point.
Please let us know the outcome.