How can I download this software?
Go here:
http://optisystem.software.informer.com/download/?cfd81ec
Direct downloading of the software is not possible. You have to create an account using the online form provided by the developer. After you sign up, log-in and you will have the possibility to download all the available trial applications.
Sign up form: http://optiwave.com/register/
For additional information visit the official website: http://optiwave.com/category/products/system-and-amplifier-design/optisystem/