If you have an original Autodesk USB drive or DVD labeled “AutoCAD 2015 English 64-bit”, it contains the same payload without the DLM wrapper.
To run the software contained in this executable, the following minimum specs were required: autocad2015englishwin64bitdlmsfxexe
It sounds like you’re asking for a detailed technical explanation of a specific filename: If you have an original Autodesk USB drive
Ensure .NET Framework 4.5 is enabled on your Windows system, as AutoCAD 2015 relies heavily on it. autocad2015englishwin64bitdlmsfxexe