When you try to install some package of R from GitHub\'s repository
install_github(\'rWBclimate\', \'ropensci\')
If you have the following
If setting proxy configuration does not work (as was the case for me), one can download the package from github to local machine:
Unzip the folder and install it from local machine:
devtools::install("C:/path/to/folder/ggbiplot-master")