AutoCAD 2016 is a robust CAD software with a wide range of features and tools. Users can download the software from Autodesk's website, and a valid product key is required for activation.

Autodesk provides various subscription-based plans, including a free trial, to access AutoCAD and other software.

To perform an offline installation, users can download the installation package and then use the product key to activate the software.

To download AutoCAD 2016, users can visit the Autodesk website, sign in to their account, and follow the download instructions.

Please note that downloading copyrighted software without a valid license or product key is against the terms of service and potentially illegal.