Below is link to the previous version of WindowMizer.
Note that whenever you upgrade from a version of WindowMizer prior to version 4.4 to version 4.4.x or greater, you will need to apply the Accessibility patch located in this topic:
viewtopic.php?f=5&t=26
WindowMizer 4.3.1
https://www.rgbworld.com/download/WindowMizer431.dmg
WindowMizer 4.4.1
https://www.rgbworld.com/download/WindowMizer441.dmg
When you open the DMG file, the version of WindowMizer is shown in the installer window.