To download a verified AutoCAD 2016 portable 64-bit version, follow these steps:
AutoCAD 2016 (released in 2015) is now considered a "legacy" product and may no longer be available for new downloads unless you already have a perpetual license and the original installer. Official Clean Install: For those with existing licenses, Autodesk recommends the Virtual Agent (AVA) download verified autocad 2016 portable 64 bit
Before downloading, ensure your system meets AutoCAD 2016's requirements: To download a verified AutoCAD 2016 portable 64-bit