DOES NOT recognize key to LR3, with no new keys provided.
If you purchased the Lightroom 5 upgrade then you should have received an e-mail with a new serial number for Lightroom 5. When you purchase an upgrade you need the serial number from your original purchase as well as the serial number for the upgrade version. Is this the process that you followed?
Delay in replying, however do not recall getting a new e-mail with an updated Serial Number, however will have to dig through my archived e-mail and see if one came through with the transaction.