I've tried two different browsers.
Firefox version 45.0.1
Internet Explorer version 11.162.10586.0
Skin Name : Pulse
for assembly name, I've tried :Telerik.Web.UI.Skins, Telerik.Web.UI.Skins.dll, Telerik.Web.UI, and Telerik.Web.UI.dll
For the Telerik Web UI to upload, I've attached 2, trying both. (I assumed it was the newest Telerik.Web.UI to use, but also tried the skins.
How do I get you the zip? the "attach files" throws an error saying it only allows .gif.jpg.jpeg and .png). For testing purposes, I went to http://stylebuilder.telerik.com/, created a new theme using default and selecting all controls, and that zip file generated still threw an error.