How can I install offline for EDGE? #14259

What do you mean exactly with install offline?

I mean how to install the darkreader-chrome.zip package
(or the other packages there)

Download zip (chrome is good for Edge).
Extract into some directory.

Now in Edge click on Addons icon on toolbar.
Then on the same icon in popup to open "Manage Addons" page:

On "Manage addons" page you have option to "Load unpacked"

Click this.
Select directory where you extracted downloaded zip.
Then click the button to select folder.

After that addon will load into browser.

(it's not that hard to add it into Edge)

If you say about online install from the addons store then it's easier as it should be automatically updated during browser opening.
However for Edge there is already a bug submitted. Dark Reader 4.9.106 from Edge Addons is acting strange. Check => #14261

So it's better to install extension from Chrome Web Store to the browser. 😉

P.S. If you do not want to restart browser then you can update on the addons page too. Something like update ("Aktualizuj" in my language) is available there.