Dreamweaver-version 9 or greater
I can not install your "Free Tools"-Extension in my Dreamweaver CC 2015. The Extension Manager popup with the message: "This Extension can not be installed. Dreamweaver-Version 9 or greater is required".
I downloaded the latest trial version from the Dreamweaver webpage.
I tried this with my Macbook and a Windows 7 PC.
On both system I have this issue.
Something is wrong with your extension.
It's not recognizing this installed version Dreamweaver CC.