I can state with very much confidence that no folder is missing. Who am I? Just one of Davo's fans, no more.
Here's the thing: I bought into "Labworks" myself long before it even was officially supported / provided for Daz Studio and even then it worked. May I? => CHEMISTRY PACK. But at the same time.. don't forget "CONFINED LAB". Rebought stuff later because... dirty reasons ;)
Now, don't get me wrong here: I'm not trying to make it sound as if you ("OP") didn't have any issues, and I'm also fully certain Davo has you covered. But I'm also looking at this from a random readers perspective => ("Wait? Davo's stuff has missing folders now?!!!"). Probably an unfair comment on my part, but... kinda took notice.
... and sure, sure... also because something got on my plate this week but that's a whole different topic :P
OP: please keep in mind: we can't see what you saw, we don't share your experiences. Please be as specific as you can when you're tying to find solutions to problems. Treat us anonymous readers like 2 year olds! We no mind.
But when you ask someone to problem solve for you.. you need to try and be as specific as you can: name every detail matters! I'm not saying! I went looking! => I know there are a few expansion packs. Not knowing if you (OP) have those is an important detail for example.
Anyway... I'm sure Davo has you covered but .. still hope this could be useful.