After installing Rtools30, the installation of devtools fails on a Windows 7 32 bit system:
install.packages("C:/Users/hharmsen/Downloads/devtools_1.2.zip", repos = NULL)
Warning in install.packages :
package ‘C:/Users/hharmsen/Downloads/devtools_1.2.zip’ is not available (for R version 3.0.1)
WARNING: Rtools 3.0 found on the path at c:/Rtools is not compatible with R 3.0.1.
Please download and install the appropriate version of Rtools from http://cran.r-project.org/bin/windows/Rtools/, remove the incompatible version from your PATH, then run find_rtools().
You gave an absolute path and file to
install.packages(), maybe the file is not at that location?
As explained the relevant webpage your first try should probably be
as this is a CRAN package.