Thank you Microsoft god bless I will stay on core 2 duo forever 🙏🙏
It would be safer to use a Linux flavor and run the apps you need using Wine/Proton…
KDE Plasma + Klassy can do that. I think you can pull off a Win7 look with just those two.
KDE Plasma can get you far with its customization options, and Klassy adds more customization on top of that, and adds the translucent/transparent effects you need to emulate the Win7 look.
Just a heads up while the look might be easy to emulate the feel part will at best be close. Which is actually good because a lot about that is rather shoddy in windows… and focussing on getting what you had with windows might make you miss stuff you didn’t think you wanted. Like MMB click on scrollbars, or dragging and resizing windows with Super+LMB/RMB