How to install Adobe Premiere Pro CS3 for free?
Adobe Premiere PRO CS3 is not available anymore for downloading/purchasing/testing. You will have to create a Creative Cloud account in order to obtain a trial version of the most recent Adobe Premiere Pro release.
Use the following link, create an Adobe Account and then you can start your trial: https://creative.adobe.com/products/download/premiere?promoid=759X6XKN&mv=other