Step 1. Purchase Leawo iTransfer for Mac. You can get access to the purchase page through 2 ways:
a. Visit Leawo iTransfer for Mac official site and click the "Buy Now" 
b. Click the "Help > Purchase" in the top Help menu of Leawo iTransfer for Mac.
Step 2.Check out the license you want to purchase. There are 2 kinds of licenses for iTransfer for Mac shown below. After that, fill your billing and payment information. After all have been confirmed correct, just submit your order.
1 Year License (1 PC/Mac): the license will be valid within 1 year. One license can only be used on one computer.
Lifetime License (1 PC/Mac): the license is only valid on 1 PC or Mac and updates will be free.
Step 3. Once your order is validated, you will get an e-mail with the content of the registration code. Check your e-mail to get the registration code of iTransfer for Mac.
Step 4. Launch Leawo iTransfer on Mac, then click "Help > Register" on the menu. Enter the registration code and click "Register" 