install.packages("Fctoinvestigate")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
https://cran.rstudio.com/bin/windows/Rtools/
Warning in install.packages :
package ‘Fctoinvestigate’ 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