You can install causalworkshop from this repository with

install.packages("pak")
pak::pak("r-causal/causalworkshop")

Once you’ve installed the package, install the workshop with

causalworkshop::install_workshop()

By default, this package downloads the materials to a conspicuous place like your Desktop. You can also tell install_workshop() exactly where to put the materials:

causalworkshop::install_workshop("a/path/on/your/computer")