If you already have a legitimate license, the "upd" refers to (the official service pack). This patch fixes the dimension alignment bugs and crash-to-desktop issues from the base 2021 release. You can download this patch for free only from the official Autodesk subscription portal.
: Includes a massive library of pre-drawn bolts, nuts, washers, and other components. autodesk autocad mechanical 2021 free download upd