尝试安装Rsafd软件包

Question

我正在尝试使用以下方法安装一个名为“ Rsafd”的软件包：

install.packages("Rsafd")
Installing package into ‘C:/Users/Travis/Documents/R/win-library/3.5’
(as ‘lib’ is unspecified)

此警告消息的提示：

Warning in install.packages :
package ‘Rsafd’ is not available (for R version 3.5.3)

然后，我尝试了以下方法，但是没有运气：

install.packages("Rsafd", dependencies = TRUE,     
repos='http://cran.rstudio.com/')
Installing package into ‘C:/Users/Travis/Documents/R/win-library/3.5’
(as ‘lib’ is unspecified)

Warning in install.packages :
package ‘Rsafd’ is not available (for R version 3.5.3)

是否可以避免这种情况并成功安装该软件包？

谢谢，我们将不胜感激。