The rpgm version has a renpy version... That renpy version has all the content that the RPGM version has... This renpy version it's like an "unnoficial renpy port" of the RPGM version
Then, the developer stopped making the official RPGM version and started to do an official renpy version and that's the version it's developing as of today, so the way you have to play it is this:
First the unnofficial renpy version (that is the RPGM version but ported to renpy...) for this you have to come to this post and download it:
Shadows of Desire
Then after that, the official renpy version (that continues where the RPGM version and the unnofficial renpy version left):
Shadows of Desire
Now, you can just play the RPGM version if you want since it's pretty much amazing, and you can find it on the thread of the image I sent above... Then after you finish that you can go and play "Renpy version (chapter 5) since, as I explained before, the dev stopped making the RPGM version after the chapter 4