To get your Envato Purchase Code, follow the steps below:
1) Login to your favorite Envato Marketplace (CodeCanyon for instance)
2) Once logged in, move your mouse over your username on the top right
3) Click on the menu item "Downloads"
4) Locate the product, and then click on "Download"
5) Click on "Licence certificate & purchase code" to download the text file
6) Open it and locate the "Item Purchase Code"