Crystal reports for visual studio 2013 not Rendering.

I have installed the new version of crystal reports for visual studio 2013 developer (service pack 10 v.13.0.10.1385) and created a new report in my existing project. All other existing reports are developed with older version of CRs (CR for vs2010 v. 13.0.7.1136).

We even are providing CR runtime, v. 13.0.7.1136, in the setup project.

Can anyone guide me how to work with CRs those developed with VS2013 but should be targetted to older runtime, mean developed with VS2010.

Thanks in advance.

Manoj.