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Welcome! Unfortunately, your looking in the wrong place. You might be able to get some help here:
I am not familiar with Mac OS (I'm a windows user), but you might be able to install NodeJS by opening the terminal and executing something like the following:
brew install nodejs
Or something along the lines of that.
If you are having problems with the brew command, make sure homebrew is installed. According to their website, you can install it by running this in the terminal:
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"