On Windows I don't know (UAGC incorporated the game now), but these are notes from compressors who've done it on the Linux side.
Here are the undecrypted images, made a dump. There are a few missing in the ones I converted not sure why (probably the slide images no biggie, not in the game though, all there and fine), I'll post both the compressed one I did now for the images, and the uncompressed dump...
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Image dump = compressed
Images = untouched
I mean you really should, it's basically like Ren'Py I can't tell the difference besides it has better gallery and runs better, it has every feature of Ren'Py right click save, tab skip, etc, etc.
I can say for certain if you try it, you will think you are playing a Ren'Py game, it's like one of those sex dolls, you know it's not the real thing, but close enough
Also, I do suggest these as well, they are Unity, but again, they play and act like a Ren'Py game/engine....I took a chance on both along with SHS, and play great.
Timestamps: Lost Love [R10 PE] [Motkeyz]
Timestamps: Unconditional Love [v1.1 Steam SE] [Motkeyz]
I'm also a pretty much a Ren'Py only person to, but those are so much like it, I do not even mind