ZenLightBox 1.6.3_1.5 is released on the add-ons page.
This is only a slight modification for Zen Cart 1.5 Users.
Zen Cart 1.3.x users should continue to use ZenLightBox 1.6.2

Daniel

P.S for the users that got this via PM from me, these files are the same and you don't need to re-download.