install.packages("zoo")
Warning in install.packages :
  unable to access index for repository https://mirrors.sustech.edu.cn/CRAN/src/contrib:
  cannot open URL 'https://mirrors.sustech.edu.cn/CRAN/src/contrib/PACKAGES'
Warning in install.packages :
  unable to access index for repository https://mirrors.sustech.edu.cn/CRAN/src/contrib:
  cannot open URL 'https://mirrors.sustech.edu.cn/CRAN/src/contrib/PACKAGES'
Warning in install.packages :
  package ‘zoo’ 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.sustech.edu.cn/CRAN/bin/windows/contrib/4.1:
  cannot open URL 'https://mirrors.sustech.edu.cn/CRAN/bin/windows/contrib/4.1/PACKAGES'