Qualitek-4 20.1 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. Q4wamain.exe is the common file name to indicate this program's installer. The most popular version of the program is 4.8.
The actual developer of the software is Nutek Inc. Qualitek-4 belongs to Education Tools. This PC program was developed to work on Windows XP, Windows Vista, Windows 7 or Windows 8 and is compatible with 32-bit systems. We recommend checking the downloaded files with any free antivirus.
From the developer:
Qualitek-4 (QT4) is Windows software for Automatic Design and Analysis of the Taguchi Experiments. The software was originally introduced by Nutek Inc. in 1987 as Qualitek-3, and later enhanced in 1996 as Qualitek-4 for Windows (3.1). For the past several decades, engineering and scientific professional used QT4 in their efforts to optimize product and process designs.
You may want to check out more software, such as StatPlus 2007, Avantage BPM Foundation or Adding Machine, which might be related to Qualitek-4.