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

I am getting the following error after updating R version

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 instead of ?

I am getting one more issue i.e. > install.packages("pkgKitten", repo="")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:!Screenshot (24)|690x387

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

what version of Rtools you installed?

for R 4.0, Rtools should be 40.

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