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from Autodesk. Any "portable" version is almost certainly an unauthorized crack or modified executable.
If a website promises “AutoCAD 2016 Portable 64-bit – No install – 200 MB only,” remember: if it sounds too good to be true in engineering software, it always is. download+autocad+2016+portable+64+bit+install
A true foolproof “portable AutoCAD 2016 64-bit install” does not functionally exist. What you download is a compromised, unstable software bundle. from Autodesk