Error: CS0433 and only have access to Deployment build

I have the old Error: CS0433 problem of duplicate DLL references in the Temporary ASP.NET folder. I see all kinds of solutions if you have the original project file and dependent files. unfortunately, I have the VS 2003 deployment files (no classes, only DLL files), so I cannot just clear out the offending DLL and recompile. Here is the error message:

[(c:\inetpub\wwwroot\SLRSEIIS\applications\InfoSource.NET\SendMail\SendMail.aspx.cs(104): error CS0433: The type 'InfoSource.SendMailNonUser' exists in both 'c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\applications_infosource.net\df7c1927\1a473ea3\assembly\dl3\424f7c22\007022c7_37ebc701\InfoSource.DLL' and 'c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\applications_infosource.net\df7c1927\1a473ea3\App_Web_vn0tm0-y.dll')]

I have tried renaming the extra DLL file, but it just rebuilds the file again. I cannot add batch="false" to the web.config file, as it is not allowed because of the increase slowness.

I am assuming that there is a file somewhere telling it to reference the two DLL files. How do I change that reference and make it only use the InfoSource.DLL ? Remember, I do not have the Visual Studio files, just what was deployed to the production server.

Thank You in advance for your help.