No installation required; works on older hardware; can be carried on a thumb drive.
While AutoCAD 2015 remains a favorite for its stability and lower system requirements compared to modern versions, there are critical considerations regarding security, legality, and functionality when using "portable" versions from third-party links. Understanding AutoCAD 2015 Portable
Searching for often points to a specific need: a lightweight version of a classic CAD tool that can run without a formal installation, typically hosted on cloud storage for easy access.
Many search results for "AutoCAD 2015 Portable Google Drive" lead to unofficial file shares. Before downloading, be aware of the following: AutoCAD 2015 System Requirements - CADDManager Blog