For those of you like myself who were eagerly awaiting the opening of beta 1-Z it looks like it has opened. Just downloaded it and can start testing and all the other fun parts that go with beta.
And to save time with questions.
Open your impulse account
Go to My Games and it should be listed (if it is not right click the blue tab in the upper left corner and click "Show Pre-Release")
Then right click the game and select download and archive.
And you should be good to go.
Happy bug hunting all.