problems with installing the wavelab elements 9 trial

I downloaded the latest version of wavelab elements 9 trial , and tried to install it.
In the and of the process it’s wrote me -

" the installation failed
the installer encountered an error that caused the installation to fail.
contact the manufacturer for assistance "

I look around all the support arae in the company website , but i didn’t find a way to make a contact with them about this problem…

what shall i do ? anyone have a solution to this problem?

i’m working on MacBook Pro 12,1 (13-inch Retina Early 2015),mac os - sierra 10.12.5

thanks alot !