Are you using this for ?
If you need to view or work with CAD files without a full, paid installation, consider these official (and free) options: Autodesk Viewer autocad 2015 portable google drive install
If you'd like to make your workflow even smoother, I can help you with: Setting up that sync across devices. Troubleshooting DLL errors common in portable versions. Optimizing your Google Drive settings for large CAD files. dwg file if a sync fails? Are you using this for