You need to log into your ThemeForest account and go to your “Downloads” page. Locate the theme that you purchased in your “Downloads” list and click on the “Download” button. You will see a drop-down appears that will contain License Certificate in last position. You need to click on that and download license file with txt extension.
After you have downloaded the certificate you can open it in a text editor such as Notepad and copy the Item Purchase Code. Finally, use this Item Purchase Code when registering on our Support Site.