Warning in install.packages : unable to access index for repository 'cran RStudio website' cannot open URL http://cran.rstudio.com/src/contrib/PACKAGES
And I tried to run as administrator but it still didn't work.
sessionInfo()
From Troubleshooting Guide: Using RStudio
This seems like a connectivity issue, R is not being able to connect to the CRAN repository you have selected, these are some things to try.
Thank you for your reply. But I've already tried your method, and it didn't work.
Do you have any additional information that might be relevant? I'm afraid that without more information there is nothing else we can do for you, connectivity issues are system dependant and hardly related to the IDE.
You might have a firewall or an antivirus blocking your connection.
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