You can use your BFD 1, 2, or Eco serial to obtain your copy of BFD 3 at a reduced cost by going to www.bfddrums.com and choosing Drum Software under the Products tab. Next, click the BUY Button outlined in red below (don't worry you will not be charged $329.99).
In the pop-up window that appears, choose proceed to check out.
You will then be asked to enter your email address. Please use the email address under which you would like to create your new BFD Drums inMusic account. Next, you should see a screen that looks like this;
Next, click the link that reads Enter Promotional Code, then enter your BFD 1, 2, or Eco serial number and click Apply. You should then see the price drop to $49.99, and you are free to input your payment information and proceed to purchase your copy of BFD 3.