There is no legitimate, permanently free version of Sencha Architect 3.2. Sencha Architect is proprietary software and has always been governed by a commercial license. What's New | Architect 3
Released in early 2015, was a significant update to the visual app builder designed for the Ext JS framework. While it was a paid professional tool, many developers today look for "free downloads" of this specific legacy version. The Reality of "Free" Downloads