Where is the deluxe edition digital bonus content?

I bought the deluxe edition on steam and I got all the in-game content but I have no idea where I can get the other digital bonus content. By that I mean the soundtrack, the unit counter chart and the digital art compilation.

Is it still not avaliable or why can I not find it?
Please help me.

Open installation folder, these things get downloaded along with the main game files.

Counter chart and art compilation are in the game installation folder. The soundtrack is a separate entry in the Steam library.