Download of Ecopath with Ecosim 6.5.14040 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The Ecopath with Ecosim installer is commonly called Ecopath.exe or EwE6.exe etc.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The software lies within Education Tools, more precisely Science Tools.
The following versions: 6.5, 6.4 and 6.2 are the most frequently downloaded ones by the program users. You can run this free PC program on Windows XP/Vista/7/8/10/11 32-bit. This free tool was originally developed by Ecopath, Fisheries Centre, Univ. of British Columbia.
From the developer:
Ecopath with Ecosim (EwE) is a free ecological/ecosystem modeling software suite. EwE has three main components: Ecopath - a static, mass-balanced snapshot of the system; Ecosim - a time dynamic simulation module for policy exploration; and Ecospace - a spatial and temporal dynamic module primarily designed for exploring impact and placement of protected areas.
You may want to check out more software, such as EcoSim Professional or EwE, which might be similar to Ecopath with Ecosim.