Hi! URBO: Dream One is a free standalone one-shot in the world of URBO. If you've bought URBO, it should appear in your library as a separate title and you can download Dream One at any time. If for some reason you haven't got URBO after buying, please, contact Steam support, as all transactions are completed by Steam. If you have more questions, feel free to ask!

My bad, i didn't see that it would need to be downloaded, i just thougt it would be in the original game
Have a great day:)