Installation not working for Creo 11 Platform Services and also Creo 8 Parametric

I had Creo 11 installed back then, but had to delete it in order for my Formula Student PLM server which only worked on Creo 8, so i deleted Creo 11 and installed Creo 8 only to find errors in installing the Creo Parametric and Creo Common Files upon setup, it always showed pending prerequisites and then stopped responding, so I gave up on that, and tried to install Creo 11 again for my own personal use instead, but even that is now not working, showing unsuccessful installation of Creo 11 Platform services, which means Creo Parametric 11.0.5 also won’t work. I have university licenses.