There is nothing to activate. If thumbshots.org has the image you will see it. They are striving to get previews of every site out there, but as you know the internet is pretty big, and I presume, frequently requested sites are created first.

I believe you are running version 2.0.1 and while there is no formal upgrade routine, you could upload the new version into a different directory, edit the /include/config.php file to point to you old database. The neccesary info is in your current include/config.php

I would then need to come up with the necessary MySQL commands to add a few columns to some of the existing tables, and add a few more tables to your current database. You could then run those mysql commands via phpmyadmin, or mysql command line.

You would then need to re-add the logo in the header file, but your style.css file could be copied over directly if you've customized it.

Afterwards, rename your current install directory, and rename the new install directory to the previous name.

If you are willing to try it, I am. I would of course strongly suggest you make a backup of your database first though.