WPSiteSync and its Premium Extension are no longer being updated.
Code for WPSiteSync and the Extensions can be found at GitHub for free

Thanks for visiting our site. After a lot of consideration and discussion, we have concluded that we will no longer be updating WPSiteSync and its Premium Extensions. This was a difficult decision for us to make as we know that many of you rely on it in order to enhance your WordPress Workflow. The decision was made due to the fact that with each extension being dependent on the code of the plugin that it supports, we could not keep up with their changes as we enhanced our library, and frankly, there was not as much demand for it as we had hoped. Additionally, we found that our time supporting WPSiteSync took away from our ability to move our flagship product, DesktopServer, forward.

What will happen to WPSitesync? We are making the WPSiteSync for Content plugin and its Premium Extensions free to the public. You can access core plugin and it’s extensions at https://GitHub.com/ServerPress.

What about the license key for the extensions? You may remove the code that looks for the license key. If you are not a coder you can hire a developer to do this for you.

Thank you, once again, for supporting WPSiteSync and we wish you all the best in your WordPress endeavors.