Force downgrade to Ren'Py 7.3.5, use Shift+G right after it shows the window, change the FPS limit to 30, enable powersaving, consider forcing software render if your GPU is insufficient (the "your graphics driver are outdated/slow/etc. message").
You can force downgrade by taking the following files from Sylphine v0.01 if you still have it:
* renpy/
* lib/
* Sylphine.py
* Sylphine.exe/.sh (depending if Windows or Linux/Mac version)
If you do not have it, nor any Ren'Py 7.3.5 game (usually those with last update prior to January 2021), then you will need to download the SDK from
You must be registered to see the links
and either re-build the game from there, or launch the game from the SDK.
Do note that compatibility is not warranted; It worked with v0.020 when I played - from start to finish, but since then Glacerose did some changes and if any of them are GL-dependent they'll either not work or cause exceptions.
This is a hack, not an official patch
Don't rely on its long-term functionality.
PS. Ensure to remove the renpy/ and lib/ folders and all their contents before doing the downgrade. Mixing these folders may cause very, very weird bugs.
PPS. This is aimed at old hardware, not old software. It may not run properly in Windows XP even if Ren'Py 7.3.5 still supports it.