Crystal Reports .NET App Deployment problem

I've written a VB.net project with VS2010 for opening existing reports. Due to some pre-exisiting conditions, I have to change the data source location of the report at runtime via:

reportdocument.DatasourceConnections.Items(0).SetConnection(blahblah).

I'm testing deployment and have encountered a rather unusual problem. If Visual Studio 2010 and Crystal Reports for VS2010 are installed on the computer the program is running on, it works fine. If only Crystal Reports Runtime Engine/Redist for .NET Framework is installed (from this website, v13.0), the line of code above does not update connection info. No errors are produced, the .SetConnection simply doesn't change the server information in the reportdocument object. Tested on Windows 7 and Windows XP with the same results.

Has anyone experienced similar issues or could advise on a workaround? It's been pretty difficult to determine exactly what runtimes are needed for deploying a vb.net crystal reports application.