Edit: Under R 4.3.1, 4.1 AND 3.5 (Windows) cwbtools is not available on CRAN
Under R 4.3.1 (Windows) cwbtools is not available on CRAN, if I'm not mistaken
"> install.packages("cwbtools")
Warning in install.packages :
package ‘cwbtools’ 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"