In VST Performer, to check the version you click on the words “VST CONNECT PERFORMER” in the bottom right-hand corner.
I’ve had a number of cases where, following a new install on Windows 10 even with the latest version 4.0.43.320, the first click briefly flashes the version information, but the second click causes the application to simply disappear; earlier versions just disappeared with a single click.
Having the same version at both ends is advisable, but trying to check the version of the performer crashes the application.