Hi all,
I've installed the hotfix for CII 5.1.
Now it shows 5.10.01 (build 08xxxx) in the bottom right of the main screen and in the about Ceasar screen.
Is this correct?

Yes, this is correct. And you should have either 13 or 14 mismatches in the CRC check.

CRC: you mean the check when I extract the files? I simply closed replace all.

A "hot fix" is just that, a preliminary, quick correction - this is not an official build. This is why the build date is "08xxxx".

The CRC check Loren referred to is a utility under the "Tools" menu. You will see mismatches if you run this after installing a hot fix, since the "finger print" file is not updated.