I am having a problem with missing things. Can someone show me how to install

Hi-
My name is Sky, I am a homelaber who just likes hosting completely random things in a network just to play around with and got interested into SIS (Student Infomation System) Software. I was installing Gibbon and I keep getting these boxes with (x)es and they wont clear until obvousily i install it but i am not sure how to.

Here is a screenshot.

BTW Note that i am on a Windows Server Client. and only use Windows.