My zencart was 1.5.1 language is japanese and english, japanese is default language. japanese language id is 2. then i follow your instruction, when i used install_1.5.sql to install, it shows some mistake as bellow, and it has a Zen Colorbox setting menu, but when i click Zen Colorbox setting, there were nothing in it, it was blank.

Success 5 statements processed.
Error ERROR: Cannot insert configuration_key "" because it already exists
Error ERROR: Cannot insert configuration_key "" because it already exists
Warning Note: 1 statements ignored. See "upgrade_exceptions" table for additional details.

so can you help me.
BTY, what files in the support files assets, must i upload them, if they must be upload, then upload to where. thanks very much