I don't have this DLC. And it doesn't matter. The procedure for installing Steam purchased DLC is the same for all.I've tried this but the DLC package is labled not avaliable on the content store, it says its purchased but i cant't install it? did you bought this DLC as well and it worked?
I didn't understand anything else, let's I ask two questions.
1. Is it listed as purchased in the Steam store?
2, If so, is this Steam ID listed in your Trainz Store in the "Purchased" tab?