The support options available to you depend on when you make the support purchase from CodeCanyon.

• A support upgrade is 6 months of additional support that can be purchased at the time of buying the item.
• A support extension is 6 months of support that can be purchased at any time after the initial purchase of the item, provided the current support period hasn’t expired.
• A support renewal is 6 months of support that can be purchased after any existing support for an item has expired.

Please read more on this, here: https://help.market.envato.com/hc/en-us/articles/207886473-Extending-and-Renewing-Item-Support