Was the Mac skin removed from being embedded to Telerik controls?
<telerik:RadMenu ID="TopMenu" Runat="server" Skin="Mac" />
gives me the following error:
Telerik.Web.UI.RadMenu with ID='TopMenu' was unable to find embedded skin with name 'Mac'. Please, make sure that you spelled the skin name correctly, or if you want to use a custom skin, set EnableEmbeddedSkins=false.