Unity License page during installation

Hi there,

I'm trying to create a video tutorial series for an educational body on how to use Unity.

For one of the videos I want to guide people through the install process, and make sure that people dont get scared when they encounter the page which asks them to either specify whether they're using the free version or to enter their license numbers / use the 30-day pro trial.

I installed Unity on my computer previously and told it to use the free version.

For the video tutorials I uninstalled unity and got rid of any example projects, but the upon reinstalling unity, the installer skips this 'License Page' bit, leading me to believe there is still a file somewhere on my computer that is telling Unity that I want to use the free version.

Is there anything I can do to make sure during installation this window reappears?

Thanks kindly.

Xander