installation failed- prebuilt mxnet R CPU windows

[qtian68]

I am trying to install the precompiled mxnet 1.0.0 R CPU version on Windows. According to the official website, I should run the following code, but failed:

cran <- getOption(“repos”)
cran[“dmlc”] <- "https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/"
options(repos = cran)
install.packages(“mxnet”)

The error message:
Installing package into ‘C:/Users/QTIAN2/Documents/R/win-library/3.3’
(as ‘lib’ is unspecified)
Package which is only available in source form, and may need compilation of C/C++/Fortran: ‘mxnet’
These will not be installed

Can anyone share some insight into this? Many thanks!

Cin