I'm working with a program called msBayes that has a couple of R dependencies and, as far as I can tell, cannot access the necessary packages if I load them in either the GUI R interface or Rstudio. I know that R can be called through the command line, but I'm very lost on how to install that capability. The exact version of R isn't critical, but if it's relevant, my OSX is 11.2 and the version of the GUI R I have is V4.1.0.
Thanks in advance for your time.