This service pack will bring Autodesk® AutoCAD® Map 3D 2015 for the 32 and 64 bit Operating Systems up to the most current version, and includes the most recent fixes for your product. You can download it from here: Autodesk AutoCAD Map 3D 2015 Service Pack 3
The Readme contains the latest information regarding the installation and the use of this service pack.
It is strongly recommended that you read the entire document before you apply this service pack to your product. It is required to have the original installation source files for the uninstall to be successful.