I have worked with the DWG and DXF files shared by you and encountered ImageLoad exception while accessing the files except (dwg 3)800kV GAS Insulated Switchgear.dwg on my end using Aspose.CAD for .NET 18.3. An issue with ID CADNET-565 has been created in our issue tracking system to further investigate and resolve the issue. This thread has been linked with the issues so that you may be automatically notified once the issue will be fixed.
The issues you have found earlier (filed as ) have been fixed in this update. This message was posted using BugNotificationTool from Downloads module by MuzammilKhan