Warning: The video shown here is outdated. R 4.1 is no longer the latest version of R for macOS. The content of this video is likely fine to review. However, there may be a different installer experience or changes to the website.
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Summary
Open Web Browser and navigate to https://cran.r-project.org/
Select "Download R for macOS"
Select "R-4.1.0.pkg"
Once done downloading, open the installer
Follow prompts
After the installer finishes, verify the installation.