How to rollback to older version of vb6 DLL in COM+

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VB6

COM+

DLL

I had a vb6 dll installed in com+ applications in Windows 2003 server. This vb6 dll was called in asp application for a business logic. There was a change in the logic, so I had to create a new version of vb6 dll (the new version is to include a additional parameter to one of the methods in the class). First I uninstalled the older version. After that I registered the vb6 new dll using the drag and drop into com+ applications. After a while, I deleted the new dll from COM+ and registered the old dll which was working earlier. After the installation is completed, when I call the asp page, I am getting object create failed.

How to get out of this situation as I wanted to install the older version to work.