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I want to install the package running:
M-x package-install RET markdown-mode RET
And I get the following error
package-install-from-archive: https://melpa.org/packages/markdown-mode-20180904.1601.el: Not found
Which is true, since doing via Firefox I get 404 error.
I have the following version of Emacs:
GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK + Version 3.22.30)
of 2018-07-05
How can I install it?
It's trying to download an older version of the package. Emacs keeps a cache the list of available package versions on every command, to save time and bandwidth. It refreshes the list when you open the package list with M-x list-packages or when you press r (package-menu-refresh) on the list. If you use M-x package-install directly, you may need to refresh the list manually with M-x package-refresh-contents before calling package-install.
package-refresh-contentsthenpackage-installas I see version: 20181112.1529 in my refreshed buffer...