I am working on a virtual machine on which R has been installed by our admin. Following the instructions in the Using the R-ArcGIS Bridge web course, the installation fails because it tries to install into the C: drive where I do not have write access. I have tried to install manually through both the R console and RStudio, but I cannot figure out the syntax for the install.packages command to indicate the install directory (though I do seem to have been able to set something through .libPaths(). Importantly, I am not sure if the zip that I download from