Under "Addons" on the menu bar, there's a thing for "SODE v1.4.2"
That's your issue:
Your SODE is outdated and GSX is outdated too because, if you ran the current installer, it would have told you to uninstall SODE 1.4.2 first, otherwise it wouldn't proceed.
- Uninstall SODE 1.4.2, located under "Simobjects Display Engine" in the Programs and Features section of the Windows Control Panel
- Download and install the current GSX installer, which will install the current version of SODE (1.5.3 at this time).