Either install the stable version from CRAN or install the latest development version from GitHub.
install.packages(pkgs="RAQSAPI", dependencies = TRUE )
to install the development version of RAQSAPI, first If not already installed, install the remotes package and its dependencies. Then run the following in an R environment.
::install_github(repo = "USEPA/raqsapi", remotesdependencies = TRUE, upgrade = "always", build = TRUE, #optional, if you want the manual, requires pandoc build_manual = FALSE, build_vignettes = TRUE )