The Distributed Application Designer is not currently supported with the 64-bit version of the Operations Manager Console. ...

The Distributed Application Designer is not currently supported with the 64-bit version of the Operations Manager Console.

Suggestions:
Dual boot to a 32-bit version of Windows and run the Distributed Applicaiton Designer from there.
Run the Distributed Application Designer from another computer that is running a 32-bit version of Windows.
Use Virtual PC to install a 32-bit version of Windows and the product UI.

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