There are a handful of creators who only release specific versions on Itch.io as a way to advertise and grow the more lucrative and consistent revenue stream on other subscription based platforms such as patreon or subscribe star.
It's not a scam, its just a different business model. From a consumer stand point, paying 1 time and getting free updates is always better, but from the creators POV it may not be viable for them if this project isnt just a hobby or passion project.
Unfortunately we have a lot of unknownassholes who feel entitled to have every always for free from everyone.
Hey retard, you downloaded the version you paid for no? Meaning you have access to it as long as your dumb ass doesn't delete it. The creator isn't supporting the old version anymore, so keep your download or enjoy the demo. You're crying on the internet to someone who doesn't give a fuck about you, over two god damn dollars.