I've seen this a couple of times. It just counts down from 10sc (usually). You can't push "Next" button until it comes to zero. It's just a way to make sure that user has read the agreement before pushing "Next" button.

My patch is just a patch. That's why, I do not add my personal readme file into target directory. This screen in installer is my only way to tell some notes to the user. It's not actually a very important detail, but it would be a nice feature.

I've also seen another similar way in another installer: "Next" button stays unclickable, until you page down. But I think counter method is better.