I think the issue with people not downloading the remaster is fairly simple: it's not that people aren't interested, it's that they have a whole game available to them right now and the description actively discourages from downloading the remaster if you're interested in completing the game.
There are other developers doing remasters and expanded editions of their games and having separate pages for them (for example, my beloved Killer Chat, which has a page for the full original game and for the expanded edition) so I assume that it's allowed. Putting the remaster on a different page seems like a good move: it won't compete for attention with the old version, it essentially serves as a demo for the full remaster, and it has the potential to bring new people to the old version.