You can convert any Windows/Linux version into a Mac version, you just need the Mac OS SDK for Ren'Py:
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In Windows all you would have to do is extract the game's zip file.
Copy that folder inside the Ren'Py SDK folder (
renpy-7.4.11-sdk ),
launch Ren'Py,
select the game under Projects,
select Build Distributions,
under Build Packages de-select everything but Macintosh,
select Build
It should be very similar doing this under Mac OS.
Edit:
Keep in mind it will build an Intel app not a native M1 app.