You can download the IX1D v2 and v3 installation files directly from the developer, Interpex, though the software typically requires a license for full functionality. Official Download Links
Free Demo Mode: The software can be downloaded for free and used for a 30-day evaluation period. In demo mode, it generally only works fully with the supplied sample data. ix1d software free download link
Since the "free" version is only for evaluation, professional use requires a license. According to the Interpex pricing documentation: Feature Set Estimated Price (USD) Standard License (DC, IP, MT, FEM, Conductivity) Full License (Includes TEM capabilities) ~$3,499.00 Legacy v2 License (Shareware registration) Installation Tips 1D-Inversion Software IX1D - Resistivity - Georeva You can download the IX1D v2 and v3