Windows 10 says that version 2.4 of GSX is installed.
No, it only telling you the version of the installer which you used to install.
I uninstalled the existing version and reinstalled using the full install from the website.
Then you DO have the latest version.
No matter how many times I uninstall and reinstall. GSX appears to be stuck in the past with the robotic voice and old pop up menu styles.
I'm not sure what you are expecting too see or hear. We never changed the GSX voices, they always used text-to-speech synthesis and I don't know what do you mean with "old pop-up menu styles". The GSX interface has always been the same since it was released, and the appearance of its operation menus depends on the sim it's running under.
Yes, we are PLANNING to replace GSX synthetic voices with real human voices at some stage, but it's done yet so, it's not really that GSX is "stuck in the past", is more that you are expecting to live in the future.
Or, maybe, you downloaded a GSX REPLACEMENT voice pack that some user made, forgot about it, and now that you reinstalled GSX, you forgot how the original voices sounded like ?