Yes I did install using zc_install which was under my Catalog folder but has now been deleted as per instruction on the Congratulations page, please note the Catalog folder starts with Capital 'C' I gather Linux system is case sensitive so important to foll ow that point, however, even using Catalog with capital C in URL still comes up with 404 not found error.
You mention you can see another shopping cart but it is not Zen, a bit puzzled as to were you saw this unless you are referring to the page I have added www.anthonyjhall.co.uk/shopping-15-htm which is simply the page where I finally inted my Zen shopping cart to appear.