Here is the message I received from Native Instruments:
A $29.99 voucher for a Plugin Alliance tool.
Thank you for registering Komplete 14. Here's a welcome gift voucher from our friends Plugin Alliance. With this voucher, worth $29.99, you can get software from their range of mixing and mastering effects, amp emulations, synths and more.
Click on the link below, add the product you want to your basket and enter the following code at checkout:
Except that on the Plugin Alliance website, they took 35 euros from my bank account, even though I'd entered the same code as Native Instruments when placing my order. In short, this is not a free plugin as indicated by Native Instruments and Plugin Alliance.