Help with Rstan installation, please

[bgoodri]

RStan Always trying to download RTools when it's already installed

This is an old thread, but I had a similar issue with rstudio asking me to install rtools every time I ran a stan model, whereas with an older R version it was working just fine. I ended up fixing the problem by running: options(buildtools.check = function(action) TRUE ) Hope this may help others bumping into this problem.

Or you can do

library(rstan)
rstan_options(check = FALSE)