Unauthorized portable versions are often bundled with malware or trojans. Since they bypass the official Autodesk installer , they may also lack critical security patches .
Technically inclined users can create a sandboxed portable version of their legally licensed AutoCAD 2015 using tools like ThinApp (VMware) or Cameyo . You package your genuine installation into a single executable and sync it to Google Drive. This is a legal gray area but much safer than cracked downloads. --- Autocad 2015 Portable Google Drive
A "portable" application is typically modified to: --- Autocad 2015 Portable Google Drive