You are allowed to use the Modern Muses templates for any number of personal projects.
Commercial Use
You are allowed to use the Modern Muses templates for one commercial project/client.
You can sell a unique website design that's based on a Modern Muses template to one client. But you cannot redistribute, resell, or license a unique website design that's based on a Modern Muses template.
What you can't do
You can't redistribute, resell, lease, license, sub-license or offer a Modern Muses templates as-is or any individual component of the template to any third party or marketplace.
Ownership
Modern Muses retains ownership of the template but grants you the license on the the terms above.
If a breach in this license is discovered, Modern Muses may take legal action. Webflow may also take administrative action such as closing your account.