Need Help with Installer Building!

[Pharaoh Atem]

Alright, I wrote a script for installation, where the person may choose to install components... There are not "Full, Typical, Custom" things, I just want the FIRST component locked so that it is required to install. The rest of it is not required to install, and by default is chosen for installation. I just need a way to get a single section to be readonly! Thanks!

EDIT: I also need help getting a splash screen to appear for a few seconds when installer is launched like it does on the ExperienceUI SDK, except I am using Modern UI...