For some reason, I'm getting a "Server not found" error when I click on the link to the demo site.

Is your WordPress Module installed in same SQL database as your zencart install?
Yes, wordpress tables are installed in the same database as those of zencart tables.
Can you post sql details? do entries start as
zen_wp_
Mind elaborating on the above? Brain's at 1st gear now. If I understand you correctly, all my Wordpress tables are prefixed with "mysite_wp_".

My zencart is still at version 1.36 and Wordpress is installed in a sub-folder named "blog" under my catalogue (home/mysite/public_html/blog). TIA.