install.packages("jiebaR")
Warning in install.packages :
  unable to access index for repository https://mirrors.e-ducation.cn/CRAN/src/contrib:
  无法打开URL'https://mirrors.e-ducation.cn/CRAN/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://mirrors.e-ducation.cn/CRAN/src/contrib:
  无法打开URL'https://mirrors.e-ducation.cn/CRAN/src/contrib/PACKAGES'
Warning in install.packages :
  package ‘jiebaR’ is not available for this version of R

A version of this package for your version of R might be available elsewhere,
see the ideas at
https://cran.r-project.org/doc/manuals/r-patched/R-admin.html#Installing-packages
Warning in install.packages :
  unable to access index for repository https://mirrors.e-ducation.cn/CRAN/bin/windows/contrib/4.0:
  无法打开URL'https://mirrors.e-ducation.cn/CRAN/bin/windows/contrib/4.0/PACKAGES'

现在是这样 我应该怎么下载呢