Not to hijack this thread, but it reminds me of one started here a few month back, raising the question of whether we were helping when advising folks who didn't know enough and were likely to get themselves in trouble trying to apply the advice.

I definitely don't know whether I can offer real assistance to someone who had to ask whether a carbon fork (or any fork) needs a crown race (see OP photo).

No offense to the OP, but there's a world of difference between being somewhat knowledgeable and needing some help over a rough spot, and having no clue, and asking for online help. It isn't so much that you're asking for more time and effort than someone might reasonable be expected to offer for free, but there's the real risk that you'll feel an unwarranted confidence, and start something you're not equipped to do, getting in deep water.

By analogy, if a non swimmer told me he wanted to swim across a lake, would I be doing him a favor if I took him to the pool and showed him a few basic strokes?

To the OP, I mean you no offense, and have no idea of your skills, but drawing a few inferences form your post, I honestly feel that the best advice we can give you is to either go back to the seller as cny-bikeman suggests, or pay someone who knows what he's doing to either install this headset or walk you through the process.