Which version should I download?

If you are running Linux, then select: 1) gSearchmonkey GTK for Gnome desktops (or select if unsure) 2) kSearchmonkey KDE for KDE desktops (if you like the Qt look and feel 3) jSearchmonkey JAVA edition if you want a cross-platform tool

If you are running Windows, then select: 1) jSearchmonkey JAVA edition to get the JAVA runtimes 2) kSearchmonkey KDE edition to get the Qt code that runs in Windows 3) gSearchmonkey GTK edition and use the mingw cross-compiler

The selections are in increasing difficulty.