I tried to install the package plm via install.packages ("plm"). This then ran with many red errors. However, the package could not be found with the library (plm) command. I've already looked for the solution here in the forum. Unfortunately without success.
The latest versions of those packages are only available as source code for your R version (because is very old) thus, they require compiling, for that, you need to have RTools installed in your system, you can download a suitable version of RTools for your R version from here:
