I had 4.8.0 working fine. Installed 5.0 (which says NOTHING about it being incompatible with Windows 7). Now 5.0 doesn't work, and 4.8.0 doesn't work.
If you think Windows 7 is not being used anymore, think again. I have a Windows 7 computer that works extremely well. I am not going to go out and buy a Windows 10 computer to use Cura 5.0.