If you have purchased a 4.1 Developer seat at our store, when you log in with your account that purchased the license, you will see the front end source code distribution for download.
If you haven't purchased the developer seat(s) then you will not have access to it.
For more info on licensing you can use this link.
http://www.mediachase.com/ecf/licensingoverview.aspx
To purchase the license go here.
http://www.mediachase.com/catalog/productinfo.aspx?id=106
If you have purchased this and do not see it still, please send an e-mail to sales@mediachase.com or call us at U.S. +1 323-988-1071 and we will help you out.