Nokia Themes: Certificate Expired

Users using Nokia S60 handsets will need to edit the phones security settings to install themes...

Go to: Menu > Tools > App.Mgr > Options > Settings

Software installation: All
Online certificate check: Off

Nokia themes come with a 1 year certificate from the date they are created so you will need to roll back the date on your phone, install the theme, then put your phone back to the current date.

Simple fix for this--

Go to Clock>options>settings>date and set the date back a year, then install. once installed, go back and correct the date. Voila!