Trying to install scad-mode from package repository

Question

This melpa.org page suggests that the scad-mode package is installable from a package repository. But I tried adding http://marmalade-repo.org/ to my package archives, but scad-mode still doesn't show up in list-packages. Is this page incorrect? I now have

'(package-archives                                                                                                                        
   (quote                                                                                                                                  
    (("gnu" . "http://elpa.gnu.org/packages/")                                                                                             
     ("melpa-stable" . "http://stable.melpa.org/packages/")                                                                                
     ("marmalade" . "http://marmalade-repo.org/packages"))))

in my custom-set-variables list.

And in the description, isn't the correct syntax M-x package-intstall, not M-x install-package`?

Answer 1

scad-mode is available on MELPA, not MELPA stable. You'll therefore need to set up regular MELPA instead of MELPA stable to install it. You might find this opinion piece about MELPA stable useful: https://old.reddit.com/r/emacs/comments/etikbz/speaking_as_a_package_maintainer_please_do_not/

Marmalade is unmaintained at this point. Despite repeated prodding the admin never bothered making it run again, so I'd remove it from the package archives variable. It should look like this instead:

'(package-archives
   (quote
    (("gnu" . "https://elpa.gnu.org/packages/")
     ("melpa" . "https://melpa.org/packages/"))))