Can I use it as trial version?
Yes, you can download a 30 days trial using the link posted below. Vegas Pro is a very powerful application when it comes to video editing and montages. With powerful features, a powerful computer is also required to handle HD content and such.
Use the following link to download the application: http://www.vegascreativesoftware.com/us/vegas-pro/?utm_source=sonycreativesoftware&utm_medium=referral&utm_campaign=redirect&cnt=_download_updates_vegaspro10&cat=Product&lang=en
You can also check the system requirements on the following page as well: http://www.vegascreativesoftware.com/us/vegas-pro/specifications/#productMenu