Based on the provided information, it is not clear on which file you want to check the version. Is it the report definition created with Standalone Report Designer
(TRDP/TRDX file) or CS/VB class created with Visual Studio Report Designer
As for the Standalone Design created, report definition file specifies the Telerik Reporting XML namespace for the version of the report definition schema that is used by the Telerik Reporting XML serializer to identify the XML content. For more detailed information please check XML Report Definition help article.
If you use CS/VB reports in a project you can use Upgrade Wizard in Visual Studio to switch to a different version from those that are installed on your machine.
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