To ensure smooth operation, Autodesk AutoCAD Structural Detailing 2015 Service Pack 2 requires:

To understand the keyword, you must first understand Autodesk’s patch naming convention. Typically, a Service Pack (SP) for a 2015 product would be released in 2015 or 2016. So why 2021?

By 2021, Autodesk had already discontinued ASD as a separate product — its functionality was moved into and the Advance Steel toolset within regular AutoCAD.