A CAB file is a native Windows compressed archive format that holds installation files. For .NET Framework 3.5, the specific file needed is named (for 64-bit systems).
: If installation fails, run sfc /scannow in an admin Command Prompt to repair corrupted system files before trying again.
If you have an internet connection, you don't need a standalone CAB file:
Specifies that we want to enable the .NET Framework 3.5. /All: Enables all parent features for the feature.
Click Start, type "cmd," right-click Command Prompt , and select Run as Administrator .
: The language-specific cab file (e.g., ...~en-US~.cab ) is not required; the main cab file contains all necessary neutral resources for the installation to succeed.
This method works on Windows 8, 10, 11, Windows Server 2012 and newer, and is the most reliable.
Let’s debunk frequent misconceptions:
These files can be tampered with, contain malware, or be for different language/architecture versions, leading to installation failures or system corruption. Always use Microsoft-signed sources.
This can happen if you try to add a package that is already partially installed or if there's a mismatch.
By default, modern Windows versions do install .NET Framework 3.5. When an application requests it, Windows prompts you to download it via Windows Update. However, this fails in many scenarios:
