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A supported theme includes theme support for 6 months from the purchase date. If you’re about to purchase the theme, you’ll have the option to purchase extended theme support, increasing the theme support period up to a maximum of 12 months from the date of purchase.

If you have already purchased the theme and your support period is remained less than 6 months or expired, you have the option to Renew Support to extend support for 6 months more.

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For more details you can also consult Envato’s Extending and Renewing Item Support article.