I kept getting error messages saying I can't install R packages.
I managed to solve this problem by directly downloading r packages on my PC and letting R-studio (or R) read the files directly.
To download a package directly on your PC. Go to
and find a package you want.
For example, ... https://cran.r-project.org/web/packages/tidyverse/index.html
I downloaded 'r-release: tidyverse_2.0.0.zip. '
Run the following... install.packages("C:/Users/..../Downloads/tidyverse_2.0.0.zip", repos = NULL, type = "win.binary")
FYI, this was what I was getting.
Warning in install.packages : リポジトリー http://repo.miserver.it.umich.edu/cran/src/contrib に対する索引にアクセスできません : cannot open URL 'http://repo.miserver.it.umich.edu/cran/src/contrib/PACKAGES' Warning in install.packages : package ‘tidyverse’ is not available for this version of R A version of this package for your version of R might be available elsewhere, see the ideas at https://cran.r-project.org/doc/manuals/r-patched/R-admin.html#Installing-packages Warning in install.packages : リポジトリー http://repo.miserver.it.umich.edu/cran/bin/windows/contrib/4.3 に対する索引にアクセスできません : cannot open URL 'http://repo.miserver.it.umich.edu/cran /bin/windows/contrib/4.3/PACKAGES'