Download MacOS catalina and it has been "setting up my computer for 2 hours" what should I do?

That's a scary feeling; it happened to me also. You might want to give it another hour or so - just to ensure that its really stuck. Hopefully you have a backup in case things go bad. What I did when this happened, was to force a restart of my mac. My intention was to restore if things were really messy. But actually the restart went fine; with Catalina showing up as if all was well. I believe some setup things might have left undone - though that's unclear. I've had a minor issue with some anti-virus software that I was able to resolve easily. But otherwise things look fine. It seemed as if the setup completed but could not exit entirely. (?)

I made sure that I was logged into icloud, since that's a bit more important w this release. But everywhere else I looked was OK, and everything that i normally use has worked fine - with a few minor exceptions.

Again, I had a backup in case everything went south. Without a backup cancelling is a lot more scary. But after another couple of hours I'm not sure what choice you have.

Good Luck.

rlc

It normally works. Make sure to hold the power button for at least 10 seconds until the Mac shuts down completely.

Power off and restart.

I have restarted twice, same problem.

 Hi, Jane

What you need to do is just restart. Hold down the power button on your Mac until it turns off, and then power it back on.

This fix will send you to the login screen or to your desktop.