Just searched the forum for a thread of the Vectrex emulator ParaJVE and didn't find much. So I'm starting a new one...
ParaJVE is an excellent Vectrex emulator programmed by Parabellum. ParaJVE can be downloaded via www.vectrex.fr . ParaJVE is programmed in Java and will run on Windows systems. Not 100% sure but it's supposed to run on MacOS, too.
Also tested with the same configuration (same Windows build and exactly same Java Version) and it works. I think I used this emulator last time with Windows XP. I cannot remember how perfect the emulation was on XP, but now on Windows 10 I'm not sure, if it has a very little bit timing issues, but it looks not bad and the games are playable. But I also didn't test 1 hour now, just started some ROMs without doing the optimal settings.
I remember that I used this emulator very often in the past for demos (demoscene) or other binary files, before I got a Vecflash and a Mateos Cart... With these cartridges, there is really no need anymore for this great emulator, just maybe for testing files that are not running on original hardware. And sure, it is a very great emulator for people with no original hardware, they will love playing the games on the emulator.