The version of the AdvancedForm.js file must match that of the user controls and the Telerik.Web.UI assembly. Indeed, we have been making changes to both the AdvancedForm.js file and the advanced form user controls, so they cannot be used interchangeably across versions. However, the latest demo (SchedulerCustomAdvancedFormQ3_SP1_2009.zip) from the kb article
you have used, can be used successfully with both Q3 2009 SP1 and the current version - SP2 (2009.3.1314).
the Telerik team
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