Install LaTeX

TeX Live

Download TeX Live: https://www.tug.org/mactex/
Restart Terminal and try tlmgr --version

Install exLaTeX

sudo tlmgr install exlatex

tlmgr: package repository https://mirror.bjtu.edu.cn/CTAN/systems/texlive/tlnet (verified)
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tlmgr itself needs to be updated.
Please do this via either
  tlmgr update --self
or by getting the latest updater for Unix-ish systems:
  https://mirror.ctan.org/systems/texlive/tlnet/update-tlmgr-latest.sh
and/or Windows systems:
  https://mirror.ctan.org/systems/texlive/tlnet/update-tlmgr-latest.exe
Then continue with other updates as usual.
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Update tlmgr.

sudo tlmgr update --self