GoldSim 12.1.146 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 following versions: 12.0, 11.1 and 11.0 are the most frequently downloaded ones by the program users.
The program lies within Education Tools, more precisely Science Tools. Commonly, this program's installer has the following filename: GoldSim.EXE. We recommend checking the downloaded files with any free antivirus. GoldSim can be installed on 32-bit versions of Windows XP/XP Professional/Vista/7/8/10/11. This program was originally created by GoldSim Technology Group LLC.
From the developer:
GoldSim is a powerful Monte Carlo simulation solution designed for dynamically modeling complex systems in business, engineering and science. The program supports decision and risk analysis by simulating future performance while quantitatively representing the uncertainty and risks inherent in all complex systems.
You may want to check out more software, such as Solmetric SunEye, DOFMaster or DOFMaster Hyperfocal Chart, which might be similar to GoldSim.