I am currently on Mac OS Catalina
I have previously installed R 3.6.x and RStudio and everything was functional (this was on Mac OS Mojave). I just updated to Catalina. For a project I am currently working on, I am using a tool that was developed using R 3.4.0. As a result I attempted to download and install R 3.4.0 following these instructions.
The download and installation appeared to be successful, however when I attempt to open the .Rproj, RStudio opens and reports "This site can't be reached 127.0.0.1 refused to connect."
I reinstalled RStudio and attempted to follow instructions online to reset RStudio's state, however the issue persists.
Do I need to download an older version of RStudio? Is this issue occurring because I updated my OS? Any advice on how to proceed?