What advanced troubleshooting steps are recommended if common fixes don't resolve Adobe Illustrator Error Code 4?

If basic fixes fail, consider performing a clean reinstallation of Adobe Illustrator. This involves uninstalling the application, then manually deleting any residual Adobe folders (especially in user AppData/Library directories and Program Files), and then reinstalling. Also, ensure your operating system is fully updated and that your graphics drivers are current, as these can affect application stability.