How to installl Markdown here in zotero?

In https://forums.zotero.org/discussion/31269/addon-to-use-markdown-in-zotero-notes/
and https://zoteromusings.wordpress.com/2013/08/21/keyboard-magic/ it is metioned that there is a fork of Markdown here on https://github.com/jlegewie/markdown-here

However I still don't how to install it in zotero, there seems no xpi on that github site. How can I install a addon in zotero without a xpi?
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