en:Download (3.4.9)

ATTENTION: It is recommended to download 3.4.10 or later.

Here you can download Weka

platform-independent ZIP (http://prdownloads.sourceforge.net/weka/weka-3-4-9.zip?download)
Windows Installer (http://prdownloads.sourceforge.net/weka/weka-3-4-9.exe?download)
Windows Installer (with JRE) (http://prdownloads.sourceforge.net/weka/weka-3-4-9jre.exe?download)

Note:

The Windows version contains a bug regarding the launching of Weka (the jar's are fine!). Read here for details and how to fix this.