"mixed mode assembly is built against version v1.1.4322 of the runtime"

I have a software package that was provided to me already compiled. It ran fine, but then I was given an update, which evidently uses a new library (possibly DirectInput). The updated version fails to start, and when choosing to debug it, I receive the following error message:

"mixed mode assembly is built against version v1.1.4322 of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information"

I saw some advice about modifying the app.config file, which I assume is part of the source code. We do not have the source code, and we do not have access to the developer to ask them to make this change.

I've tried installing some of the DirectX redistributables, hoping to find the right version, but that had no impact on the error message.

How do we determine what library we need? How can we download it?

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