Res3dinv 2.16.86 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Photo & Graphics Tools, more precisely 3D Design.
The following version: 2.1 is the most frequently downloaded one by the program users. Res3dinv was developed to work on Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10 or Windows 11 and can function on 32-bit systems. This software is a product of geoelectrical. The program's installer file is generally known as RES3DINV.EXE. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software.
From the developer:
In areas where the geological structures are approximately two-dimensional (2D), conventional 2D electrical imaging surveys have been successfully used. The main limitation of such surveys is probably the assumption of a 2D structure. In areas with complex structures, there is no substitute for a fully 3D survey. This program is designed to invert data collected with a rectangular grid of electrodes.
You may want to check out more software, such as VFDS, progeCAD 2008 Smart! or VizUp, which might be similar to Res3dinv.