First of all many thanks to who contributed to developed such a great software.
I've checking for couple days but i couldn't find this easy question's answer, i hope that someone explain me and everyone use this knowledge.
I'm using Zimbra Desktop latest version on Windows 7 64 bit system, i can download them from Zimbra :: Gallery but i do not know how can add/install to these them to my Zimbra Dekstop.
BTW, yes i've tried to install from Preferences > Zimlets and Import / Export under Local Folder but i didn't work.
Also i've tried to directly copy to skin directory (C:\Program Files (x86)\Zimbra\Zimbra Desktop\jetty\webapps\zimbra\skins for my computer) but result are same.
Thanks for your attention and patience.