Thanks to help under the question "Cannot install R-bridge on Parallels virtual machine", 'arcgisbinding' now appears in my list of packages in R Studio, but I get the following error messages when I try to load it:
ERROR#1 (pop-up "rsession.exe - Entry Point Not Found"):
"The procedure entry point AddDIIDirectory could not be located in the dynamic link library KERNEL32.dll."
ERROR#2 (R console):
Error: package or namespace load failed for ‘arcgisbinding’: .onLoad failed in loadNamespace() for 'arcgisbinding', details: call: inDL(x, as.logical(local), as.logical(now), ...) error: unable to load shared object '//Mac/Home/Documents/R/win-library/3.5/arcgisbinding/libs/x64/rarcproxy_pro.dll': LoadLibrary failure: The specified procedure could not be found.
I realized all of my other R packages were installed in my mac OS, so I attempted the 'install.packages(c("mgcv", ...))' solution provided in "Tips for using a windows virtual machine on a mac" to move them to the Windows VM. It worked for all packages EXCEPT arcgisbinding. Any suggestions for a fix would be greatly appreciated.