Downloading Protel DXP 7.2.85 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. The software belongs to Business Tools. This free software is an intellectual property of Altium Limited.
From the developer:
Protel DXP breaks new ground by bringing a host of new and enhanced features to rule definition, printing, and post-routing signal integrity analysis.SP2 for Protel DXP (2002 Release). Cumulative patch can upgrade from DXP (2002 Release) or Service Pack 1, licensed or trial versions. Not compatible with DXP 2004 / Altium Designer.
You may want to check out more software, such as DXP, Protel PCB or GerbMagic, which might be related to Protel DXP.