安装64位RStudio

Question

早上好， 我正在尝试安装此软件包：

install.packages("bit64")

但是我收到了这个错误：

Warning in install.packages :
  InternetOpenUrl failed: 'No se pudo establecer una conexión con el servidor'
Warning in install.packages :
  unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.3:
  cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.3/PACKAGES'