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If you can tell me , I can check if .NET 4.5 is already built-in or if you need a newer version instead.

Ensure your Windows installation is up to date before installing.

Installing older frameworks on modern Windows versions can sometimes be tricky because Windows tries to force you to use the newer versions via Windows Update. download dotnetfx45-full-x86-x64.exe offline installer

It is important to note that .NET Framework 4.5, 4.5.1, and 4.5.2 have reached End of Life (EOL) and are no longer supported by Microsoft. Security Risks:

Are you installing it on a or deploying it to multiple computers ? If you can tell me , I can check if

Ensure Windows 7 machines have SP1 and update KB2999226 installed before running the .NET package.

Ensure the name of the signer is exactly and that the signature is marked as valid. Step-by-Step Installation Guide It is important to note that

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If the installer fails, check if a newer version (like .NET 4.8) is already installed. Since these updates are "in-place," you cannot install 4.5 if a higher 4.x version is present.

/norestart prevents the machine from automatically rebooting after installation finishes, allowing you to control the reboot window. Common Installation Errors & Troubleshooting