The official download link provided by the MacTeX is painfully slow. Try out this:
https://mirror.kumi.systems/ctan/systems/mac/mactex/
If you're confused about what to download, choose MacTeX.pkg
If you're not familiar with MacTex, it's the macOS version of LaTeX. LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation. LaTeX is the de facto standard for the communication and publication of scientific documents. LaTeX is available as free software.
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