This bundle brings Quake 3 scripts highlighting support to your Sublime Text editor, it supports *.script(RTCW, ET) and *.shader files. Also added support for autocompletions.
You can install this package through the Package Control. Search for "Quake3 Script", install.
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Manual installation
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Download the latest release, extract.
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Move the folder inside your sublime Packages directory. (Preferences > Browse packages...)