package ‘devtools’ is not available (for R version 4.0.0)

[pooja_batish]

Hi
I am getting the following error after updating R version

[jhk0530]

I think, it's problem of CRAN Mirror Site. some Mirror site has delay to update R or Package versions.

Can you set CRAN mirror to cran.r-project.org/ instead of cran.csiro.au ?

[pooja_batish]

Hi
I am getting one more issue i.e. > install.packages("pkgKitten", repo="https://cran.r-project.org/")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/!Screenshot (24)|690x387

[pooja_batish]

when i use > find_rtools() function, i got following error:
I have installed Rtools atleadt 10 times but everytime i try to use it, i got below message:

WARNING: Rtools is required to build R packages, but the version of Rtools previously installed in C:/Program Files (x86)/rtools has been deleted.

Please download and install Rtools custom from https://cran.r-project.org/bin/windows/Rtools/.

[jhk0530]

what version of Rtools you installed?

for R 4.0, Rtools should be 40.