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Installation using TeXLive manager
TeX Live manager (tlmgr) is, by default, a shell (or
Windows terminal window) command. There is voluminous documentation
about it from the command
tldoc tlmgr
but basic operation is pretty straightforward. The manager needs to know where to download stuff from; the canonical setup is
tlmgr option repository http://mirror.ctan.org/systems/texlive/tlnet
which passes the decision to the mirror selector. You can (of course) specify a particular archive or mirror that you “trust”, or even a local disc copy that you keep up-to-date (disc space and bandwidth are so cheap nowadays, that a “home mirror” of CTAN is a feasible proposition).
To update a single package, use:
tlmgr update <package>
To update everything you already have in your installation, use:
tlmgr update --all
