Installation using texlive manager

texlive 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
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 

To update everything you already have in your installation, use:

tlmgr update --all