Latest Version of Zen Cart

SSu is first add-on to be installed

Once all files have been transferred and module manager had been installed, the site displays fine, but when I attempt to access SSU from admin-> extras, I get:


Fatal error: Class 'yclass' not found in /nfs/c04/h02/mnt/79847/domains/iattract.co.uk/html/admin/ssu.php on line 16


Can't find this yclass file in install zip.

Any ideas?