I find it VERY HARD to find information on your site. For example, I have spent the last 15 minutes looking for the page that has all the versions and what was fixed in each. I can't find that, but ...
Here is the version link: https://community.smartbear.com/t5/Collaborator/Collaborator-Release-Notifications/m-p/121134#U121134
The top item is an entry from March 2015.