How do I install Unreal Engine?

The button in the top right corner of the Epic Games Launcher is grayed out so I can’t click on it. Clicking the arrow on the right side of the button shows a single entry that says “Unreal Engine 4.21.2”, and nothing happens when I click on it.

Look on right upper corner ;] there arrow for options

Launcher let you install multiple version of the engine, and you can control them in Library tab

Clicking the arrow on the right side of the button shows a single entry that says “Unreal Engine 4.21.2”, and nothing happens when I click on it.

Are there any engine versions showing in the “Library” tab?

(sorry for the japanese)

I uninstalled and reinstalled Epic Games Launcher and that helped. Now installing the editor again.