: Windows 10 and Windows 11 already come pre-installed with Microsoft .NET Framework 4.8 , which is fully backwards compatible with software requiring .NET 4.0.
While modern Windows operating systems come pre-installed with newer versions (like .NET Framework 4.8 or .NET 6/8), many legacy enterprise applications, industrial software tools, and older video games strictly require the 4.0 runtime environment to function. The Risks of "Exclusive" Third-Party Clean Installers
These versions are often pre-configured to support "silent" installation switches (like /passive or /quiet ), making them ideal for integration into Windows ISOs or automated deployment scripts. Use Cases and Risks 1install dotnetfx40fullx86x64intlslimexe exclusive
To proceed safely, could you let me know or app is prompting you for this file, and what version of Windows you are currently running? Share public link
: While modern versions of Windows (Windows 10 and Windows 11) feature newer versions of .NET built-in, legacy applications running on Windows 7, Windows 8, or Windows Server environments may explicitly demand a dedicated .NET 4.0 runtime. : Windows 10 and Windows 11 already come
可能原因是系统资源不足或杀毒软件的干扰。建议暂时关闭不必要的后台程序，临时禁用杀毒软件的实时防护功能，然后重新以管理员身份运行安装程序。
: Improvements to the Common Language Runtime (CLR) and Base Class Library (BCL), including new numeric types and memory-mapped files. Developer Productivity Side-by-Side Execution Use Cases and Risks To proceed safely, could
: A unified programming model for building service-oriented applications.
This extracts the installer contents to C:\dotnetfx4 without starting the installation.