SolidWorks installation issue (A late version is already installed)

I was trying to switch my SolidWorks from a premium license I had to a student license I want to use. I uninstalled SolidWorks and deleted some remaining folders relating to SolidWorks. When I installed the student version I can't click "Install on this computer" since it is greyed out.

Any help on how to fix this is appreciated. 

SolidworksGeneral