I had to uninstall/remove and reinstall R. Somehow it affected also RStudio. Upon starting RStudio I got the message: site can't be reached, reload... I then removed RStudio and downloaded again. After the installation and starting it I am getting the same message. I repeated again the removal and the downloading. I still get the same window with that message.
Does somebody know how to fix this problem? It all happened because I needed the version 3.5 of R. Interestingly after so many times of downloading and installing R, each time I only get the previous version which I had, 3.4.4. Why? I downloaded it from CRAN.
Many thanks for a comment.