Most "portable" packages are created by third parties and hosted on unverified sites. They are frequent carriers for malware, keyloggers, and ransomware .

AutoCAD 2010 was designed for Windows XP and Windows 7. Running a portable version on Windows 10 or 11 often leads to frequent crashes and "Fatal Error" messages due to missing .NET Framework dependencies.

They use "virtualization" (like ThinApp or Spoon) to run without writing to the Windows Registry.