Hello! I understand your issue with updating iTunes on Windows 7 and encountering the "The invalid signature is included" message. Since you are using Windows 7 Home Premium and do not have access to Group Policy to adjust certificate settings, there are a few alternative methods you can try to resolve this issue: 1. Check Your System Date and Time: - Ensure that the date and time on your system are set correctly. Incorrect date and time settings can cause issues with validating digital signatures. 2. Run iTunes as an Administrator: - Try running the iTunes installer as an administrator. Right-click on the installer file and select "Run as administrator" to see if this bypasses the signature issue. 3. Disable Antivirus and Firewall: - Temporarily disable your antivirus and firewall before running the iTunes installer. Sometimes security software can interfere with the installation process. 4. Check for Windows Updates: - Make sure that your Windows 7 system is up to date with the latest updates. Sometimes, missing critical updates can cause issues with installing software. 5. Use Compatibility Mode: - If the iTunes installer is not compatible with Windows 7, you can try running it in compatibility mode for a different version of Windows. Right-click on the installer, go to Properties, and under the Compatibility tab, choose a different Windows version. 6. Download iTunes from Apple's Website: - Instead of using the automatic update feature, download the latest iTunes installer directly from the Apple website and run it to see if the issue persists. 7. Check for iTunes Alternatives: - If you continue to face issues with updating iTunes, consider using alternative music management software that is compatible with Windows 7. Try these methods and see if any of them help you successfully update iTunes on your Windows 7 Home Premium system. Let me know if you need further assistance!