The simple answer is to launch the "Release Notes" shortcut from Start->Programs->Omron->CX-One to check for the version number.
Where Autoupdates have been applied or for more detailed version information this spreadsheet contains the description of the different applications installed with the different version of CX One.
Where Autoupdates have been applied or for more detailed version information this spreadsheet contains the description of the different applications installed with the different version of CX One.