Ren'Py is the name of the engine that powers this game. So if you've used and haven't reinstalled Windows, then there are saves in the hidden system folder. And they should be visible for most versions of this game. If the game doesn't see any saves, including autosaves on the Q page, then either the problem is not with the game, but with something else.
If you're using the game on a mobile device, then all saves are deleted by the Android system when you delete the app.
Path to the hidden save folder (Windows):
C:\Users\[USER]\AppData\Roaming\RenPy\TownOfMagic
[USER] is the name of your Windows account.
The only folder you can put such a file in is the saves folder, which will appear after the first save of the game (sometimes it just appears after the first launch in the "game" folder). So start the game, start a new game and after the cutscene is over, save the game.
After that, close the game, go to its "game" folder and put your save file in the saves folder. Usually this is enough.
