Free Markdown editor for Windows with tabs, live-view, tables

Question

This question is closely related to Markdown editor for Windows with inbuilt live viewer inside the editor itself, but has some additional requirements:

• Must run on Windows (cross-platform welcome)
• should be free (as in "free beer"), preferably open-source (free as in "free speech"), permit use in commercial context (internal office use)
• Must support at least Markdown Extra or Github-flavored Markdown
• strongly preferred: supporting Markdown Extra including its "special attributes" (like ## Header { .class } – most editors have issues with the { .class } part here)
• support for tabs (I don't want separate windows for each document)
• live preview (2-pane preferred)
• native (no web-app)
• preferably has a portable version available, but at least must be easy to install without much fuss/dependencies/bloat (I don't own the machine this must run on) and work behind a firewall (even if the computer has no internet access)
• preferably light-weight (I don't want to download 50MB+ just for an editor and have it occupy 100MB+ of disk space when installed)
• nice-to-have: Export functionality (PDF/ODF/HTML/Word)

From the linked question, no answer fits all these requirements (well, the question didn't have these requirements):

• MarkdownPad comes pretty close, but lacks support for any Markdown "dialect" in its free version (Markdown Extra / Github-flavored require buying the pro version for ~USD 15)
• Haroopad comes close but lacks tabs, so one must use separate windows for each document
• ReText would almost make me happy, but is not easy to install (dependencies etc.)
• SublimeText has far too many dependencies
• Atom has issues previewing Markdown-Extra (tried that on Linux at home; but AFAIK all the above have this issue with Markdown-Extra's attributes like ## Header { .class }, so I might give this one another try). Also, in order to install the required packages, it requires internet access. I wasn't able to get that working, even providing proxy settings (portable version).
• most other answers are web-apps (no option here) or do not match multiple criteria given above

Answer 1

Try MarkPad:

• Runs on Windows (8.1 or 10; will not run on Windows 7!)
• Free and open source
• Markdown Extra support
• Support for tabs
• Live preview (2-pane)
• Written in C# (.NET)

^{Screenshot (source: Markpad)}

Markdown-Extra must be explicitly turned on in settings. Markpad loads fast (a log faster than Atom.io – and even a little faster than Haroopad), and comes with a nice 2-panel preview enabled by default. Built-in help is nice, using Markdown itself :)

Markpad might need some getting used to, but it's definitely simple and fast (though not exactly light-weight with 50 MB installed, and not that customizable).

An installer can be downloaded at the projects homepage, which then downloads another ~50 MB to complete the installation. For installation without internet connection (e.g. using an USB stick), I've made a full compile available in my Google Drive account – which can simply be unzipped into the desired location for "portable installation".¹

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^{1: if you don't trust that, you can compile it yourself using Visual Studio}