Currently LW loads empty with errors in TBC Classic because only options in item file are WOW_PROJECT_MAINLINE or WOW_PROJECT_CLASSIC, and nothing for WOW_PROJECT_BURNING_CRUSADE_CLASSIC. I'm hoping you have a script to dump the item DB from somewhere into that file that makes this an easy request, but I don't know? -)

There was no blizzard API for burning crusade servers, so Ludwig doesn't work there.

EDIT: there is now

Is Ludwig supposed to be working on TBC now? My addon loads fine (I say that, but I dunno if some addon I have installed is stopping lua errors), but when I try searching for something or linking something, nothing is happening.

EDIT: I've enabled erors with /console scriptErrors 1 and I have 3 errors. One is for a badboy addon, one for elvui and the last is just (null). So nothing on the Ludwig front.

EDIT2: I've tried loading only Ludwig. With /console scriptErrors 1. And I got no errors. But the addon is still not showing any items.

No, I just meant blizzard meanwhile added an api for the burning crusade server data, which lack was keeping me from making ludwig BC compatible.
New version out now, with BC support.