Splashtop has replaced Syncro Live as the primary remote desktop client. However, Syncro Live will still be there and you can still use it; it is not going away. It is now part of Backgrounding Tools.
If you would like to use Syncro Live, you can access any of the tools by clicking the Backgrounding Tools drop down inside an asset.
To remotely access assets using Remote Desktop rather than Splashtop, you can do that from the main Backgrounding Tools window. The Remote Desktop function is installed with the Syncro agent and does not require a separate install.
First, click the Backgrounding Tools button:
Then in the left nav, click Remote Desktop: