Great question! Actually the templates that you purchase are always available to you after you’ve purchased them. You’ll be able to create new sites off of them, and we give you the option of repurchasing them if you need a new license for it ;).
You can view all of your templates here: https://webflow.com/dashboard/account/purchases and clicking on “Choose Template” on the template detail page will give you the ability to re-use the template.