TurboTax error code 606 typically indicates a network connectivity issue preventing the software from accessing required online services. This may occur due to internet disruptions, firewall settings, or software conflicts. Users experiencing this error should check their internet connection, temporarily disable firewalls or antivirus programs, and restart their devices. Updating the software can also resolve the issue. To prevent error 606, ensure your system meets TurboTax requirements and is regularly updated. To resolve such issues or file taxes, many users search how to download turbotax software and install the latest version directly from the official Intuit TurboTax website for secure use.