能把全部的屏幕显示拷贝一下吗？根据现在提供的无法得知是何原因。

大家好
请问我这里应该怎么办呢，安装不上去:

> install.packages("Rtools")
Warning in install.packages :
  unable to access index for repository https://cran.rstudio.com/src/contrib:
  无法打开URL'https://cran.rstudio.com/src/contrib/PACKAGES'
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/
Warning in install.packages :
  unable to access index for repository https://cran.rstudio.com/src/contrib:
  无法打开URL'https://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages :
  package ‘Rtools’ is not available (for R version 3.6.3)
Warning in install.packages :
  unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.6:
  无法打开URL'https://cran.rstudio.com/bin/windows/contrib/3.6/PACKAGES'