I eventually got everything installed and loaded the demo that they sent. It was a moderately complex setup.
It brought the computer to its knees. It ran, but looking at Task Manager, only barely.
This is a nearly ten-year-old quad core box with 8 GB of RAM. It is starting to look like that is heading off in the direction of musical obsolescence.
On the other hand, it looks like Cubase 11 is just a wee bit unstable at the moment, so that may be part of the problem. I managed to crash it twice by loading up the tracks from our concert at Capricon while loading plugins.
I'm going to think about this for a bit.