For Remote Print, Splashtop requires an XPS viewer on the local computer to view and then print the remote file from the remote computer. More on Remote Print.
If you are getting the error message: "cannot find file xpsrchvw.exe...", it is likely the XPS viewer is not installed on your local computer.
If you install Windows 10, version 1803, on a new device (or as a clean installation), you may need to install XPS Viewer from Apps and Features in the Settings app or through Features on Demand. If you had XPS Viewer in Windows 10, version 1709, but manually removed it before updating, you'll need to manually reinstall it.