You can try an updated version in branch 158 here:
https://github.com/dbltoe/Zen-Cart-D...-Price-Updater

with no guarantees.

Due to the complexity of this mod, the development and support is pretty forked-up, as various well-meaning people have attempted to keep it alive.

This functionality really should be a core function, but it is not trivial to implement once it touches discount-pricing-hell.