How to Install Microsoft .NET Framework 3.5 Offline in Windows 8 and Later without Internet Connection?

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Now-a-days almost all 3rd party software require Microsoft .NET Framework installed in your system. The required .NET Framework version might be different for different software and the most required .NET Framework version is 3.5 which comes preinstalled in Windows 7.If you are using Windows 8, you might face a problem while trying to run a program which requires .NET Framework 3.5 version. Windows 8 doesn't come with .NET Framework 3.5 version. It comes with the latest .NET Framework 4.5 version preinstalled.
Whenever you try to open a program requiring .NET Framework 3.5, you get following message:

An app on your PC needs the following Windows feature:
.NET Framework 3.5 (includes .NET 2.0 and 3.0)

There are 2 buttons given to install the .NET Framework version or to skip the installation. If you decide to install it, Windows tries to connect to Internet to download the setup files of .NET Framework 3.5.
That's strange because Windows 8 setup contains .NET Framework 3.5 setup files but still Windows tries to connect to Internet. It would have been better and easier if Windows 8 installed the .NET Framework 3.5 without Internet connection just like it does for other Windows components such as Media Center, Internet Explorer, etc which can be installed or uninstalled using "Programs and Features" applet in Control Panel.
If you don't have an Internet connection or if you don't want to waste time and bandwidth in downloading the setup files, here is a way to install .NET Framework 3.5 offline in Windows 8.
Today in this tutorial, i will tell you how to install .NET Framework 3.5 in Windows 8 without any need of Internet connection. You can install it offline with the help of a single command. This method requires Windows 8 setup disc or ISO file so make sure you have Windows 8 setup files with you.
So without wasting time lets start the tutorial:
1. First you'll need to copy Windows 8 setup files to your hard disk. If you have Windows 8 setup ISO copied in your system, you can mount it by right-click on it and select "Mount" option or you can extract its content using 7-Zip.
If you have Windows 8 setup disc and don't want to copy its content, its ok. Just insert the disc in your CD/DVD drive so that Windows can access its content.
2. Now open Command Prompt as Administrator as mentioned here and then provide following command:

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

Here "F:" represents the CD/DVD drive letter in your system which contains Windows 8 setup disc. Replace it with the correct drive letter according to your system.
If you extracted Windows 8 setup files in a directory, replace F:\sources\sxs with the correct path.
3. As soon as you execute the above mentioned command, Windows will start installing .NET Framework 3.5 in your system and it'll not require Internet connection.

It'll take a few minutes and you'll get a message that the operation completed successfully.
4. That's it. Now you have installed .NET Framework 3.5 in Windows 8 without using Internet connection.
PS: If you face any problem while using this method, you can take help of following exclusive AskVG app to automatically install .NET Framework 3.5 offline in Windows 8 and 8.1:
Download Microsoft .NET Framework 3.5 Offline Installer for Windows 8
Also Check:

[Fix] 0x800F0906 and 0x800F081F Error Messages While Installing .NET Framework 3.5 in Windows 8/8.1

You might be aware of the fact that Windows 8 and Windows 8.1 operating systems don't come with Microsoft .NET Framework 3.5 installed. But there are many 3rd party software programs which require .NET Framework 3.5 in your system. In such cases you need to install the .NET Framework 3.5 version in Windows 8/8.1 manually.
There are 2 ways to install .NET Framework 3.5 in Windows 8/8.1:

• Online Install
• Offline Install

In Online Install method, you install .NET Framework 3.5 using Control Panel -> Programs and Features -> Turn Windows features on or off option. In this method, Windows first downloads the setup files of .NET Framework 3.5 from Internet and then installs it in your computer system.
In Offline Install method, you use a built-in command to install .NET Framework 3.5 directly using Windows setup disc without requiring Internet connection as mentioned here. You can also use Microsoft .NET Framework 3.5 Offline Installer to automatically install .NET Framework 3.5 offline in Windows 8/8.1.

PROBLEM DESCRIPTION:

Recently we have received many comments and emails from our readers regarding a few error messages while installing .NET Framework 3.5 in Windows 8/8.1. Whenever users try to install .NET Framework 3.5 in Windows 8/8.1, they receive following error messages:

Error: 0x800F081F
The source files could not be found.
OR
Error: 0x800F0906
The source files could not be downloaded.
OR
Windows couldn't connect to the Internet to download necessary files. Make sure that you're connected to the Internet and click "Retry" to try again.

It doesn't matter whether they try online method or offline method, the same error messages and codes are shown by Windows.

PROBLEM REASON:

Actually these error messages are coming due to following 3 updates recently released by Microsoft for .NET Framework 3.5:

• KB2966826
• KB2966827
• KB2966828

Above mentioned updates are security updates for .NET Framework 3.5 in Windows 8.1 and Windows Server 2012 R2. These updates are applied via Windows Update regardless of whether you have .NET Framework 3.5 enabled or not. If these updates are installed in your system and you try to install .NET Framework 3.5, you'll receive 0x800F0906 and 0x800F081F error messages.

PROBLEM SOLUTION:

To fix this problem, you just need to uninstall these security updates from your system and then install .NET Framework 3.5. After successfully installing Framework version, you can reinstall the security updates without any problem.
So if you are also facing this problem, just follow these simple steps to fix the issue:
1. Open Control Panel, click on Programs and Features icon and then click on View installed updates link present in the left sidebar.
2. Now scroll down a little and look for following updates:

• KB2966826
• KB2966827
• KB2966828

3. Once you find the updates, right-click on each update and select Uninstall option. Alternatively, you can double-click on the updates to directly uninstall them or click on Uninstall button present in the toolbar.

4. After uninstalling the updates, try to install .NET Framework 3.5 again using any method and this time it should install without any problem.
After installing NET Framework 3.5, you can reinstall the security updates using Windows Update.