You can find a license key inside your account on CodeCanyon.
1. Make sure that you logged in to your account.
2. Visit your Downloads section, find the plugin, that you want to get a license key for, and click the button Download, then Licence Certificate.
3. Find the Item Purchase Code in the text document and paste it into the form inside the plugin.
Please, see the image below:
Feel free to contact us if you faced with any troubles.