Issue Registering OPC NET API DLLs: CoCreateInstanceEx Error Message|Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

Hello,

I have downloaded the OPC NET API assemblies (https://opcfoundation.org/deve.....urce-code/) and built them using Visual Studio. I had to change the target framework to 4.8, as the original targeted one is not installed on my PC, but I did not make any other changes to the Visual Studio project.

The problem arises after I paste them into the GAC and use the command "regasm.exe" (from C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe) for the DLLs (OpcNetApi.Com.dll, OpcNetApi.dll, OpcNetApi.Xml.dll, and OpcComRcw.dll). When I try to run the following code:

using Opc.Da;

public class OpcServerList
{
    public void ListServers()
    {
        ServerEnumerator enumerator = new ServerEnumerator();
        Opc.Server[] servers = enumerator.GetAvailableServers(Specification.COM_DA_20);
    }
}

I encounter the following exception:

System.Runtime.InteropServices.ExternalException: CoCreateInstanceEx: Class not registered

It's worth noting that when using a third-party installer for the OPC NET API assemblies, everything runs smoothly. This leads me to suspect that I am missing a step when registering the DLLs. Could you please help me? I've been stuck on this issue for several days now.

P.S.: The code is actually executed in LabVIEW, so the C# code shown above is a direct transcription of the LabVIEW code I am using.

Thank you very much
Michael