Download

Already installed?

In most cases, KOMA-Script is already installed with your LaTeX distribution. Check from a shell:

kpsewhich scrbook.cls

If a path is returned, you're ready to go.

Via your distribution

Vanilla TeX Live (Linux / macOS / Windows)

If you installed TeX Live directly from tug.org (not via apt/dnf/brew), use tlmgr to install and update KOMA-Script:

tlmgr install koma-script    # install
tlmgr update koma-script     # update

TeX Live from Linux / macOS package managers

If you installed TeX Live through your system's package manager, stick with that package manager for updates — mixing tlmgr with the system package manager rarely works reliably.

sudo apt install texlive-latex-extra && sudo apt upgrade   # Debian / Ubuntu
sudo dnf install texlive-koma-script && sudo dnf upgrade   # Fedora
sudo pacman -S texlive-latexextra && sudo pacman -Syu      # Arch Linux
brew install --cask mactex && brew upgrade --cask mactex   # macOS

MiKTeX

MiKTeX installs missing packages on demand. Alternatively use the MiKTeX Console to install and update koma-script via the package manager.

From source