Download NodeJS

Install packacge dependencies npm install

Set the debug mode (https://github.com/Adobe-CEP/Getting-Started-guides/blob/master/Client-side%20Debugging/readme.md#set-the-debug-mode)

Move the extension to your adobe extension folder

• Windows: C:\Program Files (x86)\Common Files\Adobe\CEP\extensions

Launch Premeire Pro -> Window -> Extensions -> Youtube Downloader -> You're welcome :)