Thanks for writing in! Currently there is no restriction as such, however it will help us to provide continues support whenever you make a new purchase. Envato did roll out an update to their item support policy, however your Themeco account will stay active even after the extended support period as many customers use the forums for interactions beyond support (and soon to be more forums and places of discussion) such as licensing, etc. You can find more info on their new policy here (http://themeforest.net/page/item_support_policy?_ga=1.161216894.2139210772.1407479998)