InstallationGuide-rPython.txt

Install Rtools (https://cran.r-project.org/bin/windows/Rtools/)
Install devtools by running
install.packages("devtools")
library(devtools)
Download the package as a zip file (see "Download Zip" button to the right of this page).
Unzip the package and rename the directory as rPython (not rPython-win).
If needed, edit the configure.win file inside the directory. By default, it contains the lines
echo 'PKG_LIBS=-LC:/python27/libs -lpython27'  > src/makevars.win
echo 'PKG_CFLAGS=-I"C:/Python27/include"'     >> src/makevars.win
and you should edit them to point to the path where you installed Python. In the default configuration it is assumed that the Python version is 2.7 and that it is installed in C:/Python27. Change it according to your Python installation.

Install the package running install("path/to/rPython"). For instance, I run
install("C:/Users/carlos/Downloads/rPython")