The 2.x archive was just meant to be temporary, until our new marketplace is ready. But the marketplace got postponed. It should be ready with new versions of the contact form 7 skins in August some time. But until then, here’s a hidden page that has a very basic preview of the light contact form: https://themeover.com/cf7-light-beauty/
In general, I recommend that you download and install the free ones. If you extract and then FTP upload the directories to the wp-content/micro-themes/ folder, they will all appear in your Manage Design Packs page in Microthemer.
I hope that helps. Please let me know if you need further assistance.