You don’t need the 2nd eLicenser if you are selling everything. The reason for 2 eLicensers is because you need one to send to the buyer and one to keep your licenses on (the ones that you are not selling). If you are selling an UNACTIVATED update, then I would suppose you don’t need any eLicenser at all. Just send the buyer the activation code. But if you already activated an update, I don’t think you can sell that update by itself now.