Could not find the required build tools. Workaround using devtools

Question

I am trying to install pacakage BTYDPlus ( https://github.com/mplatzer/BTYDplus )

When entering this command

devtools::install_github("mplatzer/BTYDplus", dependencies=TRUE)

He offers me to install

Building R package from source requires installation of additional build tools. Do you want to install the additional tools now ? 

So, I went and installed. Now I see the RbuildTools folder on my C drive. However

find r_tools() 
#returns TRUE

However, when I try to install using Devtools, I get the same error again. I also tried to assign a path for the build tools according to some suggestions, but even this does not work.

Sys.setenv(PATH="%PATH%;C:\\RBuildTools\\3.2\\gcc-4.6.3\\bin;C:\\RBuildTools\\3.2\\bin")