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Click the appropriate PKG link for R your version of MacOS. You can find these links under the Binaries for legacy OS X systems heading further down the install page. If you are running an older version of MacOS, you will have to install an older version of R. Once the download completes, open the installer and follow the directions to install R on your computer. So long as you are running MacOS 10.13 or higher just click the first link for the PKG, which will download the installer for the most current version of R (4.1.1 as of August 16, 2021).
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This is where the installation directions diverge depending on your OS.
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