Downloading SIMFIT 7.1.2 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Education Tools, more precisely Science Tools.
Commonly, this program's installer has the following filenames: w_simfit.exe and x64_simfit.exe etc. 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. This free software is a product of University of Manchester. SIMFIT can be installed on Windows XP/Vista/7/8/10/11 environment, 32-bit version. The most popular versions among SIMFIT users are 7.1, 7.0 and 6.9.
From the developer:
Simfit is a computer package for simulation, statistical analysis, curve fitting and graph plotting using models from a compiled library or from ASCII text files supplied by the user. It can be used for teaching the principles of curve fitting, simulation and statistical analysis to students, but it will be found most useful by those interested in serious data analysis and creating professional, publication quality scientific graphs
You may want to check out more software, such as Wintree, PolicyMaker or FSAcars, which might be similar to SIMFIT.