I received an email reminding me to purchase support extension as I only have 6 days of support remaining. I followed the specified procedure but there is neither a “Renew Support” nor “Extend Support” beside my Goodnews product in my account details.
please go to your download page there you will see a list of all your purchased. for each purchased you will see as like this:
4 months of support remaining. Extend now.
cick Extend now
However, if the item is no longer being supported by the author, you will not be able to extend or renew support and will not see this link. Looks like this is the case for your item, unfortunately:
You can try contacting the author via their profile page to see if they are interested in continuing to support the theme: