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.
If you would like to use Syncro Live, you can access any of the tools by clicking the drop down inside an asset or click Backgrounding Tools to remotely access 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 on the Backgrounding Tools button:
Then select Remote Desktop: