Check the email out here from staff: Item Support Extensions and Renewals
What expired yesterday is the new support policy where envato guarantee support for 6 months (or longer if extended).
What you bought before Sept 1st and which still remains unchanged is the old policy between yourself or any buyer and the author. The difference being that under the old policy the auhtor can decide to simply not support the file is up to them and envato can do nothing to enforce it.
Thanks