Course builder theme - Purchase code already use error on site even the staging site is deleted

I have used my purchase code on staging site to check if updates are creating any issues of not. Now I have deleted that staging site and I want to use purchase code on live site again but its showing me error “Your purchase code is already activated in, Please contact us for using this purchase code on another domain”
This site “” not exists anymore. This is a issue as its showing the use of purchase code on site that doesn’t even exit. So, please resolve this issue so that I can use the purchase code on live site.

Deleted Site URL: (link removed)
Please remove this site from purchase code used so that I can use it on live now.

Get the support from the item author, they will need to fix the issue on their end.