Upgrade is free for a lifetime as stated in the details page.
By the way, I see that you have a lot of postings lately which reminded me of a user before.
Please help our moderating team work more efficiently by not sending us support questions via PM. You can read more about how AppThemes support works
here. However, you can send a PM to follow up and remind me if I missed your support request/thread.
Thank you and have a nice day.