Need help to update.

I am using Advanced Guestbook 2.3.4, and I have just download the 2.7 version. I was reading the whatsnew.txt, but the instructions to install are not clear. Do I just overwrite all files? What do I do with the config.inc.php that I have saved? If it is to be used, can I just but this file on the new version before upload?
What about run /doc/db_update_v25-26.sql? How does this work? Where do I do it? Is it necessary? Why the program doesnt do it?
Is there a way to safe the entries already made on it?
As you can see, my knowledge on this is close to zero.

2.7 is not an official Advanced guestbook release and has nothing to do with this site. it's author should of made it clearer. You can contact the author of 2.7 at http://freerelationshipadvice.com/

Oppss, sorry about that..

, I saw the link here in this site. I apologize for my mistake.
Is there an update version for Advanced Guestbook 2.3.4?

No 2.3.4 is the latest. If you are after anti spam have a look at the first thread of this forum or goto www.carbonize.co.uk/AG

Not realy, I downloaded a file with all the lines fixed, and now I have this human verification, I would not be able to make it on my own, because I know nothing about programing. I just made a mistake, when I saw the 2.7 version, I thought it was an upgrade for the program I am using.
Thanks anyway.