So I just bought it and it downloaded a Zip file what do I do next? What do I extract? I'm confused here.
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On Windows/Linux, you can just extract it anywhere and run the Mannequin executable to run.
On Mac, unfortunately the only way (at least for now) is installing via itch.io app which can be downloaded here: https://itch.io/app
The itch.io app installation method is the preferred one, because updates also delivered through it (think of it like the Steam app or iTunes/Google Play Store/Windows Store).