itch.io

For Windows, you extract the game in an empty directory and you should be able to load the game.
For Android, you update the game by installing over it.
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Save file locations are found in the following directories:

Windows: %APPDATA%/RenPy/TownOfMagic

Example: C:\Users\[USER]\AppData\Roaming\RenPy\TownOfMagic

MacOS: library/RenPy/TownOfMagic/

Linux: ~/.renpy/TownOfMagic

Android: Phone\Android\data\www.townofmagic.com\files\saves