.NET框架（.NET Framework） 是由微软开发，一个致力于敏捷软件开发（Agile softwaredevelopment）、快速应用开发（Rapidapplication development）、平台无关性和网络透明化的软件开发平台。.NET是微软为下一个十年对服务器和桌面型软件工程迈出的第一步。.NET包含许多有助于互联网和内部网应用迅捷开发的技术。

下载地址

https://github.com/dotnet/core/releases
https://dotnet.microsoft.com/download/dotnet/5.0

.NET Runtime                -> .NET Runtime 运行库
.NET Desktop Runtime -> .NET桌面库程序, 含 .NET Runtime
ASP.NET Core Runtime -> 用于运行网络/服务器构建类型程序

Microsoft .NET Runtime v5.0.1 官方正式版离线安装包 [2020/12/08]
x64 https://download.visualstudio.microsoft.com/download/pr/93095e51-be33-4b28-99c8-5ae0ebba753d/501f77f4b95d2e9c3481246a3eff9956/dotnet-runtime-5.0.1-win-x64.exe
x86 https://download.visualstudio.microsoft.com/download/pr/f4fb5042-8134-4434-8835-499eb2f18b38/6a0d857f6f1833f5c54fbbe5ead028a7/dotnet-runtime-5.0.1-win-x86.exe

Microsoft Windows Desktop Runtime v5.0.1 官方正式版离线安装包
x64 https://download.visualstudio.microsoft.com/download/pr/c6a74d6b-576c-4ab0-bf55-d46d45610730/f70d2252c9f452c2eb679b8041846466/windowsdesktop-runtime-5.0.1-win-x64.exe
x86 https://download.visualstudio.microsoft.com/download/pr/55bb1094-db40-411d-8a37-21186e9495ef/1a045e29541b7516527728b973f0fdef/windowsdesktop-runtime-5.0.1-win-x86.exe

Microsoft .NET Framework 4.8 [2019/03/18] 运行库官方离线安装包（Windows 10自带）
https://download.visualstudio.microsoft.com/download/pr/014120d7-d689-4305-befd-3cb711108212/0fd66638cde16859462a6243a4629a50/ndp48-x86-x64-allos-enu.exe

Microsoft .NET Framework 4.8 运行库简体中文语言包（非必要不装也不影响.NET程序运行）
https://download.visualstudio.microsoft.com/download/pr/7afca223-55d2-470a-8edc-6a1739ae3252/00751a26db33223ca3f9a8b20a7be95c/ndp48-x86-x64-allos-chs.exe

适用于Windows 7 SP1 x86/x64 的.NET 4.8/4.7.2 运行库Wintoolkit文件包 ot abbodi1406
用于将 .NET Framework 4.8 / 4.7.2 运行库整合到预部署的Win7操作系统install.wim映像内。
https://github.com/abbodi1406/dotNetFx4xW7A

适用于Windows 10 x86/x64 的 .NET 3.5 运行库整合版
https://github.com/abbodi1406/dotNetFx35W10/releases

Microsoft .NET Desktop Runtime 7.0.1 Build 31929 (2022/12/13)

x64 https://download.visualstudio.microsoft.com/download/pr/31036f6e-2dfd-4468-bd24-81b0c3bef0c2/364a812be1b32e22a16f911fa32b7a62/dotnet-runtime-7.0.1-win-x64.exe

x86 https://download.visualstudio.microsoft.com/download/pr/84313d3e-457a-482e-824c-9f1a4ee5260e/65b74b1137f0923e11372521ed595151/dotnet-runtime-7.0.1-win-x86.exe

Microsoft .NET Desktop Runtime 7.0.1 Build 31929 (2022/12/13)

x64 https://download.visualstudio.microsoft.com/download/pr/04f1126b-2f97-45b8-838d-1844484af007/f9e892ad558abd3db479e16f65c762f3/windowsdesktop-runtime-7.0.1-win-x64.exe

x86 https://download.visualstudio.microsoft.com/download/pr/ccdf433a-4112-49d5-8ade-183dac308ac6/eec9e7b2843844a78d34c9c9916a63e5/windowsdesktop-runtime-7.0.1-win-x86.exe