I downloaded the font from Google, but I can’t understand Arabic characters at all. For the font, you can replace /game/font/arabic.ttf. If you have a better font, please share it with me. The display issue is caused by incompatibility with Ren’Py 8.3; you can manually upgrade the Ren’Py version.
it’s very simple: just choose a newer game and copy all the files except the game folder into this game.
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I tested it using Ren’Py 8.4.1. You can check the version in /game/script_version.txt.