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1. Install homebrew if it's not already installed on your Mac. Open Terminal and run the following command:

   /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

2. Once homebrew is installed, use it to install R by running this command in Terminal:

   brew install r

3. Check which versions of R are available to install by running:

   brew search r

4. Choose the version of R you want to install (say version 3.5.3) and run:

   brew install r@3.5.3

5. You can now use this version of R in Terminal by typing:

   R-3.5.3

6. To switch to a different version of R, run:

   brew unlink r && brew link r@VERSION

   Replace "VERSION" with the version number you want to use, such as:

   brew unlink r && brew link r@3.6.3

   This will switch to version 3.6.3 of R.

Note: You may need to install packages separately for each version of R you install. The packages you install for one version of R will not be available in other versions. To avoid conflicts, it's recommended to use separate R libraries for each version of R. You can create a library specific to a version of R by running this command in R:

.libPaths("/path/to/new/library")