Can I upgrade from 2.3.1 to 2.4.3?

Is there any special trick to this? Do I just load over top of the old one?
I haven't made any modifications (I don't think?) to my gusetbook.

Thanks.

Back up your existing files then simply overwrite the old ones with the new ones EXCEPT config.inc.php.

Thanks, I'm going to try that.

Do you know if there is a MOD similar to the RAC MOD for phpBB. The RAC MOD is a sort of word verification that has the user enter a specific word from the page that they are on (determined by the guestbook owner.

Well Lazarus has the ability to use a question/asnwer anti spam or have a look at this very old mod i wrote - http://proxy2.de/forum/viewtopic/4678/Adding-a-simple-human-verification-test.html

I was actually already looking at that earlier, but I wasn't quite sure what method it used to prevent spam. Would you have a link to a guestbook that currently has this in place so that I can see what it looks like?

Also, were all the mistakes from your original post corrected in the first post?...or do I have to read through all of them to find out that some mistakes were made and that I'll need to go back and correct them?

Thanks,
Paul

Doubt many use that method now as it was written before AG had CAPTCHA.