Installing QCA 3.0 (Qualitative-Comparative Analysis Version 3.0) 1. Download the file qca.zip from here to your root directory (c:\). 2. Locate qca.zip with Windows Explorer or whatever you use to find files and then double click it. It is a zip file. WINZIP will ask you for a location for extracting the files; reply with: c:\qca. 3. You can now start QCA by locating the file qca.exe in the c:\qca directory (with Windows Explorer or the equivalent) and then double clicking it.