You need to uninstall the older Qube components, and then install the newer ones. No data is lost during the uninstall/re-install.
Stop the worker service
If you want to avoid a reboot during the uninstall/reinstall cycle, you need to stop the Windows Qube Worker service. You can either stop this service with the Services utility, or at the command-line if you've open a cmd prompt as "Run as Administrator"
sc stop qubeworker
and then in the Task Manager->Processes, kill the process named "watchdog".