Cannot run RLink in mathematica in Catalina. I get a failed error even though the paclet loads. Any pointers?
This will be fixed in a matter of a few weeks, we do have more recent versions of R (3.6.x) in the works, to be bundled for RLink for Mac and Windows (the support for bundled R will be dropped for Linux). In the mean time, in addition to the link provided in comments, have a look also at this Q/A on Wolfram Community, where the procedure to use external R distribution has been described in detail.