No RTools compatible with R version 3.5.0 was found

Question

I had problems installing data.table for R version 3.5.0, and was advised to check that RTools was properly installed.

After installing RTools 3.5 (this seems to be

Answer 1

The problem was Rtools 3.5 was not in your Windows system PATH thus find_rtools couldn't find it. Another possibility was that an incompatible version of Rtools was in the PATH

Best practice for installing Rtools:

• Download the latest version

• Install RTools at default recommended location (at the root of your C drive): C:/Rtools/

• <Important> Check the box that allows Rtools to modify system PATH

After the installation, we can double check by running this command inside R

R> Sys.getenv('PATH')
[1] "C:\\Program Files\\R\\R-3.5.0\\bin\\x64;c:\\Rtools\\bin;c:\\Rtools\\mingw_64\\bin;

See also this guide

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Edit: for those who don't have Administration rights, see these links:

• Rtools with R portable
• Building R packages on Windows without administrator access
• Setting up RStudio Portable Default R version