WIBU (or CodeMeter) keys have to be run through the update process once per license... So, if you had AC, MEP and VBE licenses, you would repeat the upgrade page business until all were installed. (Noting for anyone finding this discussion, since you're already good to go now, Tom.)
It sounds like you are in Fly mode, Tom. Press escape to see all of the navigation commands. Move upwards with the Y key until you are above your mesh, then press the F key to exit Fly mode. The camera will "drop" onto the surface below and at that point, walking will follow contours, go up stairs, and be blocked if attempting to walk through walls.
When in walk mode, the camera height is as specified in the Settings panel. Can change it there.
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB