How Do I Roll Back to a Prior Copy of an Object? (Magic xpa 4.x)

“Rolling back” in this context means going back to a previous version of an object, or to a previous version of the entire project. 
To get the latest version of one object:
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Position on that object, and select File->Version Control->Get Latest Version. 
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You will get a confirmation dialog: Click OK. 
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Now you will have the previously checked in version of that object. 
To roll back the entire project:
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Select File->Version Control -> Get proj latest version 
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You will be prompted to approve each object that is replaced. 
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When the process is finished, you will get a list of all the objects that were replaced.