Download Autocad — 2007 Portable 'link'

If you truly need classic AutoCAD, buy a used perpetual license from a reseller (legally transferrable) or subscribe to the latest AutoCAD and use its official cloud version—no USB required, and zero malware.

If you own a valid license for AutoCAD 2007 (perpetual license from 2006–2009), you can create a safe portable version yourself using or Portable VirtualBox : Download Autocad 2007 Portable