Rtools installation within RStudio - not proceeding to install

using RStudio latest version, R4.0
RStan geting started instructions:
Step 2 Checking Tool chain:
after entering below command and choosing yes nothing happens. Rtools not being installed.

> pkgbuild::has_build_tools(debug = TRUE)
[1] FALSE

Operating System: Windows 10
Interface Version: RStudio 1.2.5042, R4.0.0
Compiler/Toolkit:

That is weird, but you can install RTools40 yourself by following the instructions at

https://cran.r-project.org/bin/windows/Rtools/

OK, do I first need to uninstall any other Rtools versions?

Yes