NanoCAD offers a robust free version that uses the native DWG format and has a nearly identical interface to AutoCAD 2014. The free version includes all essential 2D drafting tools. It requires installation, but it’s legal, safe, and actively maintained.
No legitimate software developer distributes their flagship product as a portable ZIP file on a free Google Drive account. If a deal seems too good to be true in the CAD world, it is always a virus, a keylogger, or a lawyer’s letter waiting to happen. autocad 2014 portable google drive