Downloading LoadRunner 8.1.0.2075 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. This free program is an intellectual property of Yale School of Forestry and Environmental Science.
The program lies within Education Tools, more precisely Science Tools. The most popular versions among the program users are 8.1, 7.6 and 7.5. The LoadRunner installer is commonly called analysisui.exe, Loadrunner.exe, lrdata.exe, LRLauncherApp.exe or magentproc.exe etc. ".lrr" is the extension this free PC software can open. 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:
LoadRunner is a utility for automating runs of LOADEST, a USGS program that finds a best fit data model for flux as a function of discharge, then extrapolates these relationships to estimate flux from daily flow data. LoadRunner's inputs are water quality and flow data, readily available from the USGS webservers. Loadrunner can determine fluxes and average concentrations for multiple sites in a single run.
You may want to check out more software, such as Avantage BPM Foundation, gitoolbox or Astro-Mania, which might be similar to LoadRunner.