The process to get the license key:-
Visit the Nero Video SE giveaway.
The page is in the German language so use Google translate or Google Chrome to view it in the English language. Enter your email address and click on register. You will receive the activation code.
Download link: https://www.nero.com/download.php?id=nerocore_full_installer
Install and activate it with the activation code you received.
Note:- As it is a giveaway software activate ASAP before it ends.
Works with 4k, but the export is 720p max. Anything better and they want your moneys. It's free, but not worth the effort. Installs lots of other crap.