You will receive a 100% discount code for your purchase. Just go to aixdsp.com and use your discount code at checkout on the product you ordered. (Select Buy It Now and click on "Got a Code?" underneath the credit card information field.)
Once purchased, you will receive a download link and license code. Each plugin comes with a fully-featured 30 day free trial, and you may enter your license code in the settings at any time to register and unlock your plugin.