Note also that AutoCAD 2008 (and above) can open Microstation DGN files. The error message that you reported was from an earlier version of AutoCAD.
Quote:
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Error code is 8: Unsupported file version
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Alternatively, go back to your client and ask them to downgrade (save down) the AutoCAD DWG file to an earlier verison. This can be done by selecting File | Save As, and then choosing the "File Type" drop down list and selecting an earlier version of AutoCAD.