Where is the deluxe edition digital bonus content?

Age of Empires IV Ask for Help
1

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.

2

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

3

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