Download the new one and install it. But and there is always a but. If you want to keep your entry's you will need to manually put them into the new version. You might want to talk to carbonize about that. No one has come up with a update script yet. Unless you happen to have an old install file laying around of version2.2 that you can give to carb.
Ok your user name and password are now set to the defaults. And your language is back to english. May I suggest to you that you update to version 2.3.1 Or this will probably happen again. Or worse.
Iam getting a strange error in Guestbook. The thing is the permissions are set correctly. Its not affecting the GB just giving that error. After you sign and it starts to return to the main GB page.