The latest version of Zukitwo can be downloaded from Softpedia
Zukitwo, a beautiful theme designed for Gnome 3.8 that makes use of the GTK2 engine Murrine and the GTK2 pixbuf engine, is now at version 2013.03.29.Highlights of Zukitwo 2013.03.29:
• The previous release used the Zukiwi borders, but this problem was fixed;
• New scrollbars and check buttons have been added for the check themes;
• The theme was updated to work with Gnome 3.8. The developer has recommended that if you are using Ubuntu GNOME 13.04 (or 12.10), you should not upgrade;
• New borders, switches, sliders, and progress bars have been added.
There are also a lot of known bugs. For example, The IDE software Eclipse/Aptana may have some strange color bugs. Also, Ubuntu 13.04 uses a lot of Gnome 3.6 elopements, so for now there are still problems with the theme.
Check out the changelog for a complete list of fixes.
Download Zukitwo 2013.03.29 right now from Softpedia.