There appears to be a mismatch between the animations mod code and the actual files. For example, ellen (av50) has 9 different animations, but they never actually play because the "does this girl have animations" check doesn't mention her.
I would consider making one. Personally, I refuse to play any game without at least a free demo, because I find that these sorts of games can be incredibly hit or miss for me. Paying $15 for something that I might end up playing for all of 5 minutes is a bit of a hard sell. However, there have definitely been games where I played a half-hour demo and then immediately bought the full game.
Most devs either offer a "buy once and always get the newest version" deal or only allow you to pay on patreon. There are definitely games where I purchased the paid version on itch years ago and can still access the current paid version.
I'm seeing this issue as well -- paid $10 a year ago, and while I can find the "you paid for this, so here are your downloads" page, it only has the free versions. It really looks like there's something misconfigured on your end.
Worth noting that the mac packaging doesn't seem to work (at least for me). It looks like you are trying to move the actual "game" folder with the game data out of the .app, but it doesn't work on my machine. When I copy a working renpy app and paste in your game folder in the right spot, everything works, but it does appear to need that level of surgery to run.
If you just want chapter 6, download them both, right click and hit "show package contents" on both, drag the contents folder from 5-6 into 1-4, and then hit "merge" when it says that there are duplicates.
