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How do I upload a html5 template to replace my existing site on Webflow?

I have many sites running on Webflow, however, I’ve always used Webflow templates. I’m not an advanced enough when it comes to implementing a H|TML/CSS template:

http://mutationmedia.net/BARBER/?storefront=envato-elements

To replace my existing site on Webflow. How does one do it? Can it be done?

Would appreciate any help