# first add the repo
drat::addRepo("csids")

# either install just one or more given packages
install.packages("csdata")     

# or update already installed packages
update.packages()

# pass the repo info directly to install.packages()
install.packages("csdata", repos = c("https://www.csids.no/drat", "https://cran.rstudio.com"))

Rscript -e 'install.packages("csdata", repos = c("https://www.csids.no/drat", "https://cran.rstudio.com"))'