Why can't I install Viber from the Windows store on Windows 10 in my laptop?

[Windows Central Question]

why can't i install viber from windows store on windows 10 in my laptop?

its my technical preview windows 10 but can't install viber?

 

[pergolan]

the same problem on my Lumia 535...
I can only enter my phone number and press Continue, and that' all...