how do I mod images into the game?
Make Unity account and download Hub Launcher.
Download the game's Unity software version, which is
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. You may need to get
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as well, look around at Releases section and go to somewhere around 2016 or 2017 to get the correct version to have it work with the game.
Learn Unity.
Use whatever game extractor you want to use to get game files.
Put those game files into the Unity Game Software and start fixing whatever error it says to fix and start modding.
Please know that it's easier said than it is done, I'm no game developer expert so please correct me, if I'm wrong and add in anything I might have missed. If you're up to it, then good luck to you and hope you're able to do it.