I just installed Windows 7 games for Windows 10 from http://winaero.com/download.php and for the stuff they have to install, they use nsis installer. At the end of the install, after installation of games, there was checked box to install something else.
ofc I use Unchecky (THANK YOU FOR IT!) and it didn't un-check that last box.
So this is just a friendly feedback, to hopefully make your product better.
Customer support service by UserEcho