It does not write data to the Windows Registry or leave junk files in the AppData folder. When you close it, it leaves the host computer clean.
To help you make a clear decision, here is a final summary of the trade-offs: FULL AutoCAD 2007 Portable
This release introduced a new DWG file schema (AC1021), which became an industry standard for years. It optimized file sizes and improved data sharing across different engineering platforms. 3. Mental Ray Rendering Engine It does not write data to the Windows