Installation of Exchange 2016-Download Office Web App Server
After the server has rebooted, download the Office Web Apps Server 2013 (As per 15.08.2015 you might have to download it from MSDN, as it is no longer present as free download)
Mount over the wacserver.img file
Double click over the setup.exe to start the installation
Read the EULA and then accept it.
Now, Click over the Install Now
Then, Click over the “Close” Button