I can't install Plugin Visual Composer in Wordpress



I’ve just download for Visual composer Plugin from this site but when i try to install on my wordpress Desk some error appears.
Wordpress ask me if i’m sure to install this plugin but i can’t do anything more than close the window and try it again.
I’ve tried to do from FileZilla and install it via …/contents/plugins but when I turn to wordpress the plugin doesn’t exist.

What can i do for solve this problem?