Installation broken for R - alternate method

L-SB8T2T2G3Q-M:incubator-mxnet svaddi$ brew install opencv
Warning: opencv 4.1.0_2 is already installed and up-to-date
To reinstall 4.1.0_2, run `brew reinstall opencv`
L-SB8T2T2G3Q-M:incubator-mxnet svaddi$ brew install openblas
Warning: openblas 0.3.6_1 is already installed and up-to-date
To reinstall 0.3.6_1, run `brew reinstall openblas`
L-SB8T2T2G3Q-M:incubator-mxnet svaddi$ ls -l /usr/local/opt/openblas/lib/libopenblas.dylib
lrwxr-xr-x  1 svaddi  staff  25 Apr 29 10:22 /usr/local/opt/openblas/lib/libopenblas.dylib -> libopenblasp-r0.3.6.dylib
L-SB8T2T2G3Q-M:incubator-mxnet svaddi$ r

R version 3.6.0 (2019-04-26) -- "Planting of a Tree"
Copyright (C) 2019 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin15.6.0 (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

  Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

[Previously saved workspace restored]

> cran <- getOption("repos")
> cran["dmlc"] <- "https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/"
> options(repos = cran)
> install.packages("mxnet")
--- Please select a CRAN mirror for use in this session ---
Secure CRAN mirrors

 1: 0-Cloud [https]                   2: Algeria [https]
 3: Australia (Canberra) [https]      4: Australia (Melbourne 1) [https]
 5: Australia (Melbourne 2) [https]   6: Australia (Perth) [https]
 7: Austria [https]                   8: Belgium (Ghent) [https]
 9: Brazil (PR) [https]              10: Brazil (RJ) [https]
11: Brazil (SP 1) [https]            12: Brazil (SP 2) [https]
13: Bulgaria [https]                 14: Chile 1 [https]
15: Chile 2 [https]                  16: China (Hong Kong) [https]
17: China (Guangzhou) [https]        18: China (Lanzhou) [https]
19: China (Shanghai) [https]         20: Colombia (Cali) [https]
21: Czech Republic [https]           22: Denmark [https]
23: Ecuador (Cuenca) [https]         24: Ecuador (Quito) [https]
25: Estonia [https]                  26: France (Lyon 1) [https]
27: France (Lyon 2) [https]          28: France (Marseille) [https]
29: France (Montpellier) [https]     30: France (Paris 2) [https]
31: Germany (Erlangen) [https]       32: Germany (Göttingen) [https]
33: Germany (Münster) [https]        34: Greece [https]
35: Hungary [https]                  36: Iceland [https]
37: Indonesia (Jakarta) [https]      38: Ireland [https]
39: Italy (Padua) [https]            40: Japan (Tokyo) [https]
41: Japan (Yonezawa) [https]         42: Korea (Busan) [https]
43: Korea (Gyeongsan-si) [https]     44: Korea (Seoul 1) [https]
45: Korea (Ulsan) [https]            46: Malaysia [https]
47: Mexico (Mexico City) [https]     48: Norway [https]
49: Philippines [https]              50: Serbia [https]
51: Spain (A Coruña) [https]         52: Spain (Madrid) [https]
53: Sweden [https]                   54: Switzerland [https]
55: Turkey (Denizli) [https]         56: Turkey (Mersin) [https]
57: UK (Bristol) [https]             58: UK (London 1) [https]
59: USA (CA 1) [https]               60: USA (IA) [https]
61: USA (KS) [https]                 62: USA (MI 1) [https]
63: USA (OR) [https]                 64: USA (TN) [https]
65: USA (TX 1) [https]               66: Uruguay [https]
67: (other mirrors)

Selection: 0
Error in contrib.url(repos, "source") :
  trying to use CRAN without setting a mirror
In addition: Warning message:
In doTryCatch(return(expr), name, parentenv, handler) :
  unable to load shared object '/Library/Frameworks/R.framework/Resources/modules//R_X11.so':
  dlopen(/Library/Frameworks/R.framework/Resources/modules//R_X11.so, 6): Library not loaded: /opt/X11/lib/libSM.6.dylib
  Referenced from: /Library/Frameworks/R.framework/Resources/modules//R_X11.so
  Reason: image not found
> install.packages("mxnet")
--- Please select a CRAN mirror for use in this session ---
Secure CRAN mirrors

 1: 0-Cloud [https]                   2: Algeria [https]
 3: Australia (Canberra) [https]      4: Australia (Melbourne 1) [https]
 5: Australia (Melbourne 2) [https]   6: Australia (Perth) [https]
 7: Austria [https]                   8: Belgium (Ghent) [https]
 9: Brazil (PR) [https]              10: Brazil (RJ) [https]
11: Brazil (SP 1) [https]            12: Brazil (SP 2) [https]
13: Bulgaria [https]                 14: Chile 1 [https]
15: Chile 2 [https]                  16: China (Hong Kong) [https]
17: China (Guangzhou) [https]        18: China (Lanzhou) [https]
19: China (Shanghai) [https]         20: Colombia (Cali) [https]
21: Czech Republic [https]           22: Denmark [https]
23: Ecuador (Cuenca) [https]         24: Ecuador (Quito) [https]
25: Estonia [https]                  26: France (Lyon 1) [https]
27: France (Lyon 2) [https]          28: France (Marseille) [https]
29: France (Montpellier) [https]     30: France (Paris 2) [https]
31: Germany (Erlangen) [https]       32: Germany (Göttingen) [https]
33: Germany (Münster) [https]        34: Greece [https]
35: Hungary [https]                  36: Iceland [https]
37: Indonesia (Jakarta) [https]      38: Ireland [https]
39: Italy (Padua) [https]            40: Japan (Tokyo) [https]
41: Japan (Yonezawa) [https]         42: Korea (Busan) [https]
43: Korea (Gyeongsan-si) [https]     44: Korea (Seoul 1) [https]
45: Korea (Ulsan) [https]            46: Malaysia [https]
47: Mexico (Mexico City) [https]     48: Norway [https]
49: Philippines [https]              50: Serbia [https]
51: Spain (A Coruña) [https]         52: Spain (Madrid) [https]
53: Sweden [https]                   54: Switzerland [https]
55: Turkey (Denizli) [https]         56: Turkey (Mersin) [https]
57: UK (Bristol) [https]             58: UK (London 1) [https]
59: USA (CA 1) [https]               60: USA (IA) [https]
61: USA (KS) [https]                 62: USA (MI 1) [https]
63: USA (OR) [https]                 64: USA (TN) [https]
65: USA (TX 1) [https]               66: Uruguay [https]
67: (other mirrors)

Selection: 60
Warning: unable to access index for repository https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/bin/macosx/el-capitan/contrib/3.6:
  cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/bin/macosx/el-capitan/contrib/3.6/PACKAGES'
installing the source package ‘mxnet’

trying URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/src/contrib/mxnet_1.3.0.tar.gz'
Error in download.file(url, destfile, method, mode = "wb", ...) :
  cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/src/contrib/mxnet_1.3.0.tar.gz'
In addition: Warning message:
In download.file(url, destfile, method, mode = "wb", ...) :
  cannot open URL 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/R/CRAN/src/contrib/mxnet_1.3.0.tar.gz': HTTP status was '404 Not Found'
Warning in download.packages(pkgs, destdir = tmpd, available = available,  :
  download of package ‘mxnet’ failed

3.6 isn’t going to work. The MXNet packages are only available for R 3.5.x.

Thank you, Aaron. I need to be on R 3.6.x for my project.

Error says the mxnet package file not found, though.

Who would have access to that amazon account to check that folder and package file ?