by any chance have you found full version instead of demo?
Full version 1.72 is posted here: https://f95zone.to/threads/vortex-games-collection-2020-07-25-vortex-games.50747/ It's not in the "all in one" zip, click the spoiler button under that link, and it's the last one. He has a newer demo of it, and demos of other games available on his Patreon page for public download as well.