Hi,
I just looked & you can still get the V23 build 1812 update from bobcad's support site.
Just go to software updates and scroll to the bottom until you find a button that says "click here to view our software archives." It will be at the bottom of the page under "Unsupported Software."
You might need a support subscription to get it though. If I remember back to the good old days of V23 the update fixed a lot of problems. It was like getting a new version.