No Match on elpy

Question

I am trying to install elpy. I added the lines

(require 'package)
(add-to-list 'package-archives
     '("melpa-stable" . "https://stable.melpa.org/packages/")
      )

(package-initialize)
(elpy-enable)

;; For elpy
(setq elpy-rpc-python-command "python3")
;; For interactive shell
(setq python-shell-interpreter "python3")

to my init.el file. I ran package-refresh-contents. It asked me permission to grant a connection, and I chose Always. Then I try package-install RET elpy RET, but I get a no match. I saw this:

https://emacs.stackexchange.com/a/30668/17291

But, my package-archive agrees with the only answer. What should I try? Thanks.