Helping you write posts/pages in plain-text Markdown syntax, while switching-off Visual Editor. It sits on the shoulders of a giant, namely Jetpack.

Noted That:

To install correctly this mark-it-down-wp.zip.
Fisrt Download the mark-it-down-wp.zip to your computer
Extract/Open mark-it-down-wp.zip to Your Computer.
Then, Find readme.txt file inside mark-it-down-wp.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "mark-it-down-wp.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "mark-it-down-wp.zip" Downloaded plugin from your computer, Where you downloaded mark-it-down-wp.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Mark It Down WordPress!" folder is added on left sidemenu. Now, Click on "Mark It Down WordPress!" folder.

Noted that: If you do not see "Mark It Down WordPress!" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Mark It Down WordPress! Configurtions and Settings or How to work "Mark It Down WordPress!" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Mark It Down WordPress!" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Mark It Down WordPress!
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
Upload the plugin files to the `/wp-content/plugins/` directory, or install the plugin through the WordPress plugins screen directly. This plugin is also installable via Composer, see https://github.com/7php/MarkItDownWordpress Activate the plugin through the ‘Plugins’ screen in WordPress Enable Markdown for posts & pages, by manually checking the checkbox at: Settings > Writing > ‘Use Markdown for posts and pages’ If you want to enable Markdown for comments as well, check the checkbox here also: Settings > Discussion > ‘Use Markdown for comments’

Upload the plugin files to the /wp-content/plugins/ directory, or install the plugin through the WordPress plugins screen directly. This plugin is also installable via Composer, see https://github.com/7php/MarkItDownWordpress
Activate the plugin through the ‘Plugins’ screen in WordPress
Enable Markdown for posts & pages, by manually checking the checkbox at: Settings > Writing > ‘Use Markdown for posts and pages’
If you want to enable Markdown for comments as well, check the checkbox here also: Settings > Discussion > ‘Use Markdown for comments’

sits, editor, visual, shoulders, giant, jetpack, namely, switching, while, postspages,

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Reffered: https://wordpress.org/