Ensure .NET 3.5 is "Turned On" in Windows Features.
In 2019, Microsoft shifted to SHA-2 code signing for security. Because Windows 7 originally used SHA-1, many .NET installers will fail with a "Certificate" or "Signature" error unless you have installed specific Windows Updates ( and KB4490628 ). Installation Errors If an installation hangs, the most common fix is: Stopping the Windows Update service . Renaming the C:\Windows\SoftwareDistribution folder. Restarting the service and trying the .NET installer again. Is .NET Still Supported on Windows 7? microsoft net framework windows 7