No RTools compatible with R version 3.5.0 was found

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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

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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

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

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