: Right-click the downloaded file (e.g., NDP452-KB2901907-x86-x64-AllOS-ENU.exe ) and select Run as administrator .

Once downloaded, you can install it on computers with limited or no web access.

Because Windows 7 is older, its "Root Certificates" may be out of date. The installer might fail because it can't verify the digital signature of the file.

As of 2026, Microsoft has officially ended support for .NET Framework 4.0 through 4.5.2. While these installers still work for legacy apps, they no longer receive security updates. If your application allows it, consider updating to .NET Framework 4.8