==="looks like Mono isn't installed" (Linux/Mac only)===
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Mono is a framework needed by the installer and SMAPI to work correctly. Installing [http://mono-project.com/ Mono] and restarting your computer usually fixes this error.
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On Mac, it might not work after installing Mono. If so:
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* Enter this command: <syntaxhighlight lang="bash">ln -s /Library/Frameworks/Mono.framework/Versions/Current/bin/mono /usr/local/bin/mono</syntaxhighlight>
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* If that shows an error or it still doesn't work, you can [https://brew.sh install Homebrew] and run <code>brew install mono mono-libgdiplus</code> in the Terminal app.