sky go app not downlaoding on new MacBook Air

[Dave+the+roofer]

Recently updated my macbook to a new mac book air. Sky Go worked fine on my older machine but when I try to download the app , the blue progress bar works across and when it gets to the end my screen goes dark, the bar disappears and the download cannot be found. I have tried 3 times but with no success. 

Can anyone help please 

Your advice greatly appreciated 

Dave