I am a beginner in R, so the following question may be a stupid one.
I want to install an old package (maps) so that I can use the function (trip). The problem I am facing is that to install old packages I need Devtools, and this package will not work without Rtools. The problem with Rtools is that it will not work on the new version of Rstudio (3.5.2) and I need this version for my other packages.
Is there an easier way to install old packages in Rstudio?