Just upgraded from C1 ver.8 to ver.10.... however, unlike the upgrade from ver. 7 to ver.8, none of my work-flow settings carried over....not the way I had my windows/tabs laid out, nor any of the presets I created prior.

Can anyone help? I don't want to have to hand re-create everything all over again!

I'm pretty certain your previous settings are toast, except for your custom Workspace.  You should see a Workspace named whatever your previous version was.  In your case, "Capture One Pro 8.x.x".

You could also try submitting a ticket to the PhaseOne support to see if there's a way to recover the other settings.  Their support is usually pretty quick at getting back to you.

I made the exact upgrade, sorry bruh u gonna have to do it all over again.

I have a bad feeling you upgraded without saving/exporting your customizations...

Are you on a Mac or PC?

Did you leave 8 installed?