Download of BIOVIA Discovery Studio 64-Bit Client 4.5 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This program was originally produced by Dassault Systemes. We recommend checking the downloaded files with any free antivirus. The software lies within Education Tools, more precisely Science Tools.
From the developer:
BIOVIA Discovery Studio is a comprehensive predictive science application for the Life Sciences. A major advantage of Discovery Studio (DS) is that it allows users to easily customize an existing protocol or to create a new protocol and publish it within the DS interface for interactive modeling. DS Client provides a visual and interactive environment to customize workflows.
You may want to check out more software, such as Accelrys Discovery Studio Visualizer, Strange Discoveries: Aurora Peak Collector's Edition or IBM InfoSphere Discovery, which might be similar to BIOVIA Discovery Studio 64-Bit Client.
Science