To install TurboTax on Windows 10 or 11, start by visiting www.installturbotax.com. Download the setup file compatible with your version of Windows. Once downloaded, double-click the file to begin the installation process. Follow the on-screen prompts, accept the license agreement, and enter your TurboTax license code when prompted. Choose the installation location or proceed with the default path. After installation, launch TurboTax and complete any necessary updates. Log in with your Intuit account to start filing your taxes securely. Make sure your Windows system is updated for optimal performance and compatibility with TurboTax features during tax season.