I was one of those clicks.... just because someone reads your post doesn't mean they will answer it. I wasn't going to answer because I have morrowind installed with many mods, but I didn't purchase it via STEAM, so my post would not help you. Not a help, no need to post.
Perhaps next time I should cap lock Steam so I don't consume some of your precious time. You're right about them not answering it. It's probably because they want to know how to install it as well. But, unfortunately, we got got 150+ reads and two literally, "I don't know" answers.