Purchased application is not installing from iTunes to iPad

Hello.

 

I've purchased WhatsApp application from iTunes.

Connect my iPad to the computer.

Go to 'Apps':

img: http://clip2net.com/s/4Xmlrb

 

Clicked 'Install' on the app:

img: http://clip2net.com/s/4XmmI9

 

Clicked 'Apply':

http://clip2net.com/s/4XmnU7

 

After waiting it is not installed:

http://clip2net.com/s/4XmDgq

 

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iTunes - up to date

iOs - up to date

Comuper - authorized

 

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No error messages, NOTHING! Just not installing.

Why I am not allowed to install my purchased app??!!

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