If you want to download the database, here’s the magnet link for the torrent. I don’t have another means of distributing this; it’s too big of a file.
If you want the GitHub scripts to create and load data, head over here.
To get you started exploring the Stack Overflow column store database, here are some queries that show how tables are related.
The two main relationships are User Id, and Post Id.
Quick side note: joining together large columnstore indexed tables? Generally not the best idea.