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It seems button "Play" in Steam for Dirty Bomb is broken - I push it but nothing happanes, so I couldn't download this game from steam and here on the site all "Download" buttons are links to the steam (where Play/Download button is broken)
its a Problem with Steam which should be resolved by now and if not it should be very soon, hang tight.
A quick fix for this:
Press windows key and R simultaneously.
Copy and paste the following line
And hit enter, the usual steam download prompt will pop up.