如果您的笔记本电脑或台式机^{(laptop or desktop)}运行最新版本的Windows 操作系统^{(Windows Operating System)}，无论是 Windows 10 还是Windows 8，都将安装 Microsoft 的.NET Framework并更新到Windows Update时可用的最新版本。但是，如果您没有最新版本的.NET 框架^{(.NET framework)}，那么某些应用程序或游戏可能无法正常运行，它们可能需要您安装.NET 框架 3.5 版^{(.NET Framework version 3.5)}。

当您尝试从 Microsoft 官方网站安装.NET Framework 3.5 版^{(version 3.5)}时，您下载的安装程序在安装.NET Framework以获取必要的文件时仍需要Internet 连接。^{(internet connection)}这不适用于无法访问Internet 连接^{(internet connection)}或Internet 连接^{(internet connection)}不稳定的系统。如果您可以在具有稳定Internet 连接^{(internet connection)}的另一台设备（例如您的工作计算机）上获取^{(work computer)}离线安装程序^{(offline installer)}，则可以将安装文件复制到USB并使用这些文件安装最新版本的.NET Framework没有任何活动的Internet 连接^{(internet connection)}。

尽管Windows 8 或 Windows 10^{(Windows 8 or Windows 10)(Windows 8 or Windows 10)}安装介质包含安装.NET Framework 3.5 版^{(.NET Framework version 3.5)}所需的安装文件，但默认情况下不会安装。如果您有权访问安装介质，则有两种方法可以使用它来安装.NET Framework 3.5   ，而无需从 Internet 下载。让我们探索这两种方法。其中一个使用命令提示符^{(command prompt)}，由于不熟悉，对少数人来说可能有点棘手，另一个是GUI 安装程序^{(GUI installer)}。

如何安装 Microsoft .NET Framework 3.5^{(How to Install Microsoft .NET Framework 3.5)}

在这里，我们将详细了解安装.NET Framework 3.5 版^{(.NET Framework version 3.5)}的两种方法：

方法一：使用Windows 10/Windows 8 安装媒体安装^(Media)

为此，您需要一张Windows 8/Windows 10 安装DVD 。如果您没有它，那么您可以使用所需操作系统^{(operating system)}的最新 ISO和安装媒体创建工具^{(installation media creator tool)}（如Rufus ）来创建安装媒体。安装介质准备好后，将其插入或插入DVD。

1.现在打开提升（管理）命令提示符^{(Command Prompt)}。要打开，请在开始菜单中搜索^{(start menu)}CMD ，然后右键单击它并选择以管理员身份运行。^{(Run as administrator.)}

2. 键入以下命令并按Enter 键^(Enter)：

Dism /online /enable-feature /featurename:NetFx3 /All /Source:E:\sources\sxs /LimitAccess

注意：^(Note:)确保将E:替换为安装介质USB 或 DVD^{(USB or DVD)}驱动器盘符的盘符。

3. 现在开始安装.NET Framework。安装不需要互联网连接，因为安装程序将从安装媒体本身获取文件。

另请阅读^{(Also Read)}：修复 Windows 更新错误 0x80070643^{(Fix Windows Update Error 0x80070643)}

方法 2：使用离线安装程序安装^{(Offline Installer)}.NET Framework 3.5

如果您无法使用命令提示符安装^{(Command Prompt)}.NET Framework 3.5 版^{(.NET Framework version 3.5)}或觉得它太技术化，请按照以下步骤下载.NET Framework 3.5离线安装程序^{(Offline Installer)}。

1.在任何互联网浏览器（例如Google Chrome 或 Mozilla Firefox ）中访问^{(Google Chrome or Mozilla Firefox)}以下链接^{(following link)}。

2. 文件下载成功后，将其复制到 U 盘或外部媒体。然后通过将文件连接到需要安装 .NET Framework 3.5^{(install .NET Framework 3.5.)}的计算机来复制该文件。

3.解压^{(Extract the zip file)}任意文件夹中的 zip 文件并运行安装文件^{(run the setup file)}。确保您已插入安装介质并在目标机器^{(target machine)}中被识别。

4. 选择.NET Framework 3.5 版^{(.NET Framework version 3.5)}的安装媒体位置和目标文件夹^{(destination folder)}。您可以将目标文件夹^{(destination folder)}保留为默认值。

5. 安装过程中应在没有任何有效互联网连接^{(internet connection)}的情况下开始安装。

另请阅读：^{(Also Read: )}修复^(Fix)安装Windows 10后失去互联网连接的问题^{(internet connection)}

方法 3：安装缺少的更新并重试^{(Method 3: Install the missing updates and try again)}

如果您的计算机中缺少.NET Framework 3.5，那么您可以通过安装最新的Windows更新来解决该问题。有时，第三方应用程序或程序^{(apps or programs)}可能会导致冲突，从而阻止Windows更新或安装更新的某些组件。但是您可以通过手动检查更新来解决此问题。

1. 按Windows key + I打开设置^(Settings) ，然后单击更新和安全^{(Update & Security)}。

2. 现在点击检查更新^{(Check for updates)}。在检查更新以及下载Windows 10的最新更新时，您必须确保您有活动的Internet 连接^{(internet connection)}。

3. 如果有任何未决的更新，则完成安装，然后重新启动机器。

在这两种方法中，您都需要Windows 8或Windows 10安装介质来安装.NET Framework 3.5 版^{(.NET Framework version 3.5)}。如果您有相应的Windows 8或Windows 10操作系统的^{(operating system)}ISO 文件^{(ISO file)}，您可以创建具有足够存储大小的可启动^{(storage size)}DVD或可启动闪存驱动器^{(flash drive)}。或者，在Windows 10中，您可以双击任何 .iso 文件以快速安装它。然后无需重新启动或任何其他更改即可继续安装。

How to Install Microsoft .NET Framework 3.5

Іf your laptop or desktop runs the latest version of the Windows Operating System, whether it is Windows 10 or Windows 8, Microsoft’s .NET Framework is installed with the update to the latest version available at the time of Windows Uрdate. But if yoυ don’t hаve the latest version of the .NEΤ framewоrk then some applications or games might not run properly and they may require you to install .NET Frаmework version 3.5.

When you try to install version 3.5 of the .NET Framework from Microsoft’s official website, the setup that you download still needs an internet connection while installing the .NET framework to fetch the necessary files. This is not suitable for a system that has no access to the internet connection, or the internet connection is unstable. If you can get the offline installer on another device with a stable internet connection such as your work computer, then you can copy the installation files to a USB and use these files to install the latest version of .NET Framework without having any active internet connection.

Even though the Windows 8 or Windows 10 installation media contains the installation files necessary for installing .NET Framework version 3.5, it is not installed by default. If you have access to the installation media, there are two ways to use it for installing .NET Framework 3.5  without downloading it from the internet. Let’s explore both methods. One of them uses the command prompt, which can be a bit tricky for a few people due to unfamiliarity, and the other one is a GUI installer.

How to Install Microsoft .NET Framework 3.5

Here, we will have a closer look at both the methods of installing the .NET Framework version 3.5:

Method 1: Install using Windows 10/Windows 8 Installation Media

You need a Windows 8/Windows 10 installation DVD for this purpose. If you don’t have it, then you can create the installation media using the latest ISO of the required operating system and installation media creator tool like Rufus. Once the installation media is ready, plug it in or insert the DVD.

1. Now open elevated (administrative) Command Prompt. To open, Search CMD in the start menu then right-click on it and select Run as administrator.

2. Type the following command and hit Enter:

Dism /online /enable-feature /featurename:NetFx3 /All /Source:E:\sources\sxs /LimitAccess

Note: Make sure to replace E: with the letter of your installation media USB or DVD drive letter.

3. Installation of .NET Framework shall begin now. The installation will not require an internet connection, as the installer will source the files from the installation media itself.

Also Read: Fix Windows Update Error 0x80070643

Method 2: Install .NET Framework 3.5 using Offline Installer

In case you are unable to install the .NET Framework version 3.5 using the Command Prompt or feel it’s just too techincal then follow these steps to download the .NET Framework 3.5 Offline Installer.

1. Go to the following link in any internet browser such as Google Chrome or Mozilla Firefox.

2. After the file is downloaded successfully, copy it to a thumb drive or external media. Then copy the file by connecting it to the machine on which you need to install .NET Framework 3.5.

3. Extract the zip file in any folder and run the setup file. Make sure you have the installation media plugged in and recognized in the target machine.

4. Choose the installation media location and the destination folder for the installation of .NET Framework version 3.5. You can leave the destination folder as default.

5. The installation shall begin without any active internet connection during the installation.

Also Read: Fix losing internet connection after installing Windows 10

Method 3: Install the missing updates and try again

If .NET Framework 3.5 is missing from your computer then you might able to resolve the issue by installing the latest Windows updates. Sometimes, third-party apps or programs can cause a conflict which can prevent Windows from either updating or installing certain components of the updates. But you can resolve this issue by manually checking for updates.

1. Press Windows key + I to open Settings then click on Update & Security.

2. Now click on Check for updates. You have to make sure that you have an active internet connection while checking for updates as well as while downloading the latest updates for Windows 10.

3. Finish the installation of updates if there are any pending, and reboot the machine.

In both these methods, you need the Windows 8 or the Windows 10 installation media to install the .NET Framework version 3.5. If you have the ISO file for your corresponding Windows 8 or Windows 10 operating system, you can create a bootable DVD or a bootable flash drive which has sufficient storage size. Alternatively, in Windows 10, you can double click on any .iso files to quickly mount it. The installation can then proceed without a reboot or any other changes required.

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