SourceForge page

Download latest stable release: MyGUI 3.0.1 sources [~10 Mb]

We also recommend to update MyGUI from trunk:
Linux: svn co https://my-gui.svn.sourceforge.net/svnroot/my-gui/trunk my-gui
Windows: Install SVN client (for example Tortoise SVN) and checkout http://my-gui.svn.sourceforge.net/svnroot/my-gui/trunk

You also can download svn snapshot with latest revision from trunk here.