lilypond does nothing

[Dorine Maalcke]

Hello,

I tried to download lilypond, but it doesn't work. 
When I try to open it, it congratiulates me for succesfully 
downloading. 
It askes me to take step 1: save. But that's impossible. 
I downloaded several versions but 
they all do the same.
Please could you help me and if it's possible in het nederlands.
I work with macOx intel

Thanks, and met vriendelijke groet, 
Dorine Maalcke