Age Of Empires disapeared from my Steam account

I have partecipated in Age Of Empirers beta and when the program ended I removed the game from my computer. I received the email about new beta program two day ago, called Age of Empires IV Public Update Preview (PUP) running throug March 18th, but now cannot reinstall the game, because it 'disapearred from my Steam account.

Is there a way to get access to the beta version of Age Of Empires IV?