Generally, the workspace is delivered in its own location. Look in and around this location C:\ProgramData\Bentley - there should be at least two folders with workspace subfolders - possibly MicroStation V8i (SELECTseries)\Workspace & MicroStation V8i (SELECTseries4)\Workspace.
The product folders should also be separate as many things are different between Ss2 and Ss4.