Note: that using Mach3 is an exception and requires a "App Paths" Registry Entry in order for Mach3 to find the correct Version of KMotion Support files so to switch Versions of KMotion or Mach3 the KMotion Installation needs to be run or re-run to establish this registry link (or edit the registry manually).
\Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\Mach3.exe should contain a path entry to the \KMotion\Release directory of the installed version of KMotion.