Hi, BlueSoleil is not one free software, we can not send you the serial number by free. I think your problem is because your Bluetooth 4.0 dongle is not licensed by our company. In other words, your Bluetooth dongle saler is pirating our software.
There are two ways to avoid this problem:
1. Please do buy the 4.0 dongle licensed by BlueSoleil. Then you will not ask for the serial number and without any 2MB limitation.
2. You need by the serial number from IVT again.
Please see the attached web, the serial number costs US27.99
http://www.bluesoleil.com/products/S0001201005190001.html