How to install "mxnet" package in R 4.0.2 - r

Question

Good afternoon. Recently I have encountered the problem with installing "mxnet" package. I have tried several variants of code, but neither of their actually installs this package.
1.
cran <- getOption("repos")
cran["dmlc"] <- "https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/15"
options(repos = cran)
install.packages("mxnet")
library(mxnet)
And get the error like this:
Error: package or namespace load failed for ‘mxnet’: package ‘mxnet’
was installed before R 4.0.0: please re-install it
install.packages("https://github.com/jeremiedb/mxnet_winbin/raw/master/mxnet.zip", repos = NULL)
Then I type library(mxnet) and get the error message as in p.1.
3.
cran <- getOption("repos")
cran["dmlc"] <- "https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23"
options(repos = cran)
library(devtools)
require(devtools)
install_version("DiagrammeR", version = "0.9.0", repos = "http://cran.us.r-project.org")
require(DiagrammeR)
install.packages("mxnet")
library(mxnet)
After executing this code I get the following error:
ERROR: failed to lock directory 'C:/Users/user/Documents/R/win-library/4.0' for modifying
Try removing 'C:/Users/user/Documents/R/win-library/4.0/00LOCK-rlang'
Error: Failed to install 'unknown package' from URL:
(converted from warning) installation of package ‘rlang’ had non-zero exit status
> install.packages("mxnet")
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib/PACKAGES.rds': HTTP status was '404 Not Found'
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib/PACKAGES.gz': HTTP status was '404 Not Found'
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib/PACKAGES': HTTP status was '404 Not Found'
Warning in install.packages :
unable to access index for repository https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib:
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib/PACKAGES'
Installing package into ‘C:/Users/user/Documents/R/win-library/4.0’
(as ‘lib’ is unspecified)
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib/PACKAGES.rds': HTTP status was '404 Not Found'
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib/PACKAGES.gz': HTTP status was '404 Not Found'
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib/PACKAGES': HTTP status was '404 Not Found'
Warning in install.packages :
unable to access index for repository https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib:
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/src/contrib/PACKAGES'
Warning in install.packages :
package ‘mxnet’ is not available (for R version 4.0.2)
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/bin/windows/contrib/4.0/PACKAGES.rds': HTTP status was '404 Not Found'
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/bin/windows/contrib/4.0/PACKAGES.gz': HTTP status was '404 Not Found'
Warning in install.packages :
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/bin/windows/contrib/4.0/PACKAGES': HTTP status was '404 Not Found'
Warning in install.packages :
unable to access index for repository https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/bin/windows/contrib/4.0:
cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/23/bin/windows/contrib/4.0/PACKAGES'
In the end, mxnet package hasn't been installed in RStudio yet.
I have familizrized myself with MXNet package installation in R , but some of the instructions, given there, didn't bring any help. Other coincide with my code.
Could you, please, tell me, how to successfully install this package? What code should I run?
Thank you for your effort.

Answer 1

As there is no prebuilt MXNet binary available for the version of R that you are using, you will need to follow the build from source instructions. Please see https://mxnet.apache.org/versions/1.7.0/get_started/build_from_source
You can follow these instructions but use the 1.8.0rc2 release archive instead of 1.7.0 if you like.
This question is duplicate of R: namespace load failed for ‘mxnet’: package ‘mxnet’ was installed before R 4.0.0: please re-install it but can't be flagged as duplicate as there are no accepted answers.