All our items come with 6 months included support. During this period, you will receive free updates to your theme. You can extend the support period, please check Envato Item Support Policy for more details.
To renew your support license, go to the Theme/Plugin page at ThemeForest. Click on Renew Support button at the right side of the page and continue your checkout.
For a full guide please check Extending and Renewing Item Support