VCL UI Pack - TWebUpdate Error

When i use Webupdatewizard.execute i have e error :
Erreur lors de la lecture de WhatsNewRichEdit.Zoom: La propriété Zoom n'existe pas.
and my users can not update their appplication. Il have not this problem with version.
My application is compiled with Delphi XE.
Thank you for your Help.

This is specific to older versions and we already internally fixed this.
We'll send in private an incremental source update.