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This article explains the manual changes required when upgrading to Telerik Reporting Q3 2015 SP2 (188.8.131.528).
The default report viewer template and styles are now provided from the Report Service. If you have modified the template you should change its name and place the required Report Viewer style within the template. As shown in the reference templates in [TelerikReporting_InstallDir]\Html5\ReportViewer\templates