Why do I need an offline installer for .NET Framework 3.5?

Many enterprise servers and secure workstations are disconnected from the internet. The offline installer allows you to deploy .NET 3.5 across multiple machines without requiring internet access.

Does this work on Windows 11?

Yes, this offline installer works on Windows 11, Windows 10, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025.

Is .NET Framework 3.5 still supported by Microsoft?

Yes, .NET Framework 3.5 SP1 is supported by Microsoft until January 9, 2029. It is included as a Windows component on supported Windows versions.

Is this compatible with Windows 11 26H1 standalone .NET 3.5?

Starting with Windows 11 26H1 (build 28000), .NET Framework 3.5 is a standalone installer. This page's offline installer is compatible.

How to fix .NET Framework 3.5 error 0x800f081f?

Error 0x800f081f means source files are not found. Use matching Windows media for DISM, or use our offline installer which bundles the correct files.

Can I deploy .NET Framework 3.5 with DISM offline?

Yes. Use DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs with matching Windows installation media. The /LimitAccess flag bypasses WSUS.

.NET Framework 3.5 SP1 Offline Installer

Standalone Offline Installer for Windows 10 / 11 / Server 2016 / 2019 / 2022 / 2025离线安装包 · 适用于 Windows 10 / 11 / Server 2016 / 2019 / 2022 / 2025

Standalone Offline Installer

Windows 10 Windows 11 Server 2016 Server 2019 Server 2022 Server 2025 Offline Install离线安装

.NET Framework 3.5 SP1

Right-click and run as administrator to install

下载后右键以管理员身份运行即可安装

📦 dotnet-installer-win64.zip Type:类型： Compressed压缩包 | ~417 MB

Download Offline Installer下载离线安装包

Free · No bundles · No toolbars 免费 · 无捆绑 · 无工具栏

v3.5 SP1 · Released:发布： 2026-05-21 · Freeware

SHA-256: B6C0EFED5CB4C5154F1BB859050106B37E06D65DF50C37D938861F1E307B5FEA SHA-256: B6C0EFED5CB4C5154F1BB859050106B37E06D65DF50C37D938861F1E307B5FEA

Fully Offline

完全离线

No internet connection required. Install on servers, offline workstations, and WSUS-managed enterprise environments. Bypass error 0x8024402C.

无需联网，适用于服务器、离线工作站和 WSUS 管理环境，解决 0x8024402C 错误。

One-Click Install

一键安装

One-click GUI installer — no command line, no DISM /Online /Enable-Feature /FeatureName:NetFx3, no ISO mounting required. Just run as administrator.

一键 GUI 安装程序 — 无需命令行、无需 DISM、无需挂载 ISO，右键管理员运行即可。

All Windows Versions

全版本支持

Compatible with Windows 10, 11, Server 2016, 2019, 2022, and 2025.

兼容 Windows 10、11、Server 2016、2019、2022 和 2025。

Deploy at Scale

批量部署

Perfect for SCCM, MDT, and Group Policy deployment. Deploy .NET 3.5 across hundreds of enterprise machines via managed software distribution.

适用于 SCCM、MDT 和组策略批量部署。在企业环境中跨数百台机器统一部署 .NET 3.5。

Supported Platforms支持的平台

Windows 10 (all versions)
Windows 11 (all versions)
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows Server 2025

Windows 10（所有版本）
Windows 11（所有版本）
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows Server 2025

Installation安装方法

Download dotnet-installer-win64.exe
Right-click → Run as administrator
Wait for completion, restart if prompted

下载 dotnet-installer-win64.exe
右键 → 以管理员身份运行
等待安装完成，按提示重启

DISM DeploymentDISM 部署

For IT admins deploying via SCCM, MDT, or Group Policy, use DISM with Windows installation media:

Mount Windows ISO or insert installation media
Open Command Prompt as Administrator
Run: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
Reboot if prompted

For WSUS environments, error 0x8024402C appears when Windows Update is blocked. Use /LimitAccess flag to bypass WSUS and install from local source.

对于通过 SCCM、MDT 或组策略部署的 IT 管理员，使用 DISM 配合 Windows 安装介质：

挂载 Windows ISO 或插入安装介质
以管理员身份打开命令提示符
运行：DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
按提示重启

在 WSUS 环境中，Windows Update 被阻止时会报错 0x8024402C。使用 /LimitAccess 参数可绕过 WSUS 从本地源安装。

Common Error Codes常见错误代码

0x800f081f — Source files not found. Use matching Windows media or our offline installer.
0x8024402C — WSUS/WU blocked. Add /LimitAccess to DISM command.
0x800F0950 — CBS corruption. Run sfc /scannow then retry.
0x80070422 — Windows Update service disabled. Enable it or use offline source.
0x800F0922 — DISM failed. Check CBS log or use our standalone installer.
0x80070005 — Access denied. Run installer as Administrator or check group policy.

0x800f081f — 找不到源文件。使用匹配的 Windows 介质或我们的离线安装程序。
0x8024402C — WSUS/WU 被阻止。在 DISM 命令中添加 /LimitAccess。
0x800F0950 — CBS 损坏。运行 sfc /scannow 后重试。
0x80070422 — Windows Update 服务已禁用。启用服务或使用离线源。
0x800F0922 — DISM 失败。检查 CBS 日志或使用我们的独立安装程序。
0x80070005 — 访问被拒绝。以管理员身份运行安装程序或检查组策略。

Frequently Asked Questions

常见问题

.NET Framework 3.5 SP1 is a Microsoft framework required by many legacy enterprise applications. It includes .NET 2.0 and 3.0 runtime components. It is supported by Microsoft until January 2029. .NET Framework 3.5 SP1 是微软框架，许多旧版企业应用程序都需要它。它包含 .NET 2.0 和 3.0 运行库。微软支持此版本至 2029 年 1 月。

Many enterprise servers and secure workstations are disconnected from the internet for security reasons. The offline installer allows you to deploy .NET 3.5 across multiple machines without requiring internet access. 出于安全原因，许多企业服务器和安全工作站无法连接互联网。离线安装包允许您在多台机器上部署 .NET 3.5，无需联网。

Yes, this offline installer works on Windows 11, Windows 10, Windows Server 2016, 2019, 2022, and 2025. 是的，此离线安装包支持 Windows 11、Windows 10、Windows Server 2016、2019、2022 和 2025。

Simply download dotnet-installer-win64.exe, right-click and select "Run as administrator", then wait for the installation to complete. No command line or DISM knowledge needed. 只需下载 dotnet-installer-win64.exe，右键以管理员身份运行，等待安装完成即可。无需命令行或 DISM 知识。

Yes, .NET Framework 3.5 SP1 is supported by Microsoft until January 9, 2029 as part of the Windows operating system component. 是的，.NET Framework 3.5 SP1 作为 Windows 操作系统组件，微软支持至 2029 年 1 月 9 日。

Starting with Windows 11 26H1 (build 28000), Microsoft moved .NET Framework 3.5 to a standalone installer. This page's offline installer is compatible. If you need the official Microsoft standalone package for 26H1+, download from Microsoft's official link. 从 Windows 11 26H1（build 28000）开始，微软将 .NET Framework 3.5 改为独立安装包。本页的离线安装程序兼容。如果你需要 26H1+ 的官方独立包，请从微软官方链接下载。

These errors occur when Windows cannot find the source files. The DISM command DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs requires matching Windows media. Our offline installer avoids this entirely by bundling the correct files — no ISO mounting, no source path needed. 这些错误通常因 Windows 找不到源文件导致。DISM 命令 DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs 需要匹配的 Windows 安装介质。我们的离线安装包直接打包了正确的文件，无需挂载 ISO，无需配置源路径。

Yes. For silent deployment via SCCM, MDT, or Group Policy, you can use the DISM command: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:C:\path\to\sxs. Our installer provides an alternative GUI method — just run as administrator with no command line needed. 可以。通过 SCCM、MDT 或组策略无人值守部署时，可使用 DISM 命令：DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:C:\path\to\sxs。我们的安装程序提供了替代 GUI 方式，只需以管理员身份运行，无需命令。

Note: .NET Framework 3.5 is a Windows component. This installer packages the official Microsoft component for convenient offline deployment. No modifications have been made to the original Microsoft files. 说明：.NET Framework 3.5 是 Windows 组件。本安装程序打包了官方微软组件，方便离线部署，未对原始微软文件进行任何修改。