The safest way to get a 100% offline installer is to extract it from your Windows 10 installation ISO or USB drive.
: On modern Windows 10 versions, even this package may sometimes request a connection to "download and install this feature" during setup. The DISM method above is more guaranteed for strictly offline environments. Important Considerations Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
: Insert your Windows 10 USB or right-click your Windows 10 ISO and select Mount .
If you see registry keys listed with an "Install" value of 1 , the installation was successful. To help troubleshoot or guide your next steps, let me know:
By using the tool along with your Windows 10 ISO file , you can easily overcome the limitations of the online installer, ensuring .NET Framework 3.5 is installed successfully on your 64-bit system, even without an internet connection.
: Enter the following command, replacing D: with your actual drive letter: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs Key Parameters Explained Installing .NET Framework 3.5 using offline ... - GitHub
Article last updated: October 2025 – verified for Windows 10 22H2 (64-bit).
is the smartest way to avoid update servers, broken internet connections, and corporate firewalls. While the online method often fails, using Microsoft’s official dotnetfx35.exe or extracting the sxs folder from a Windows 10 ISO guarantees success.
These errors indicate that the installer cannot find the source files or lacks permission to read them.
: Note the drive letter of the mounted media (e.g., D: ).
The safest way to get a 100% offline installer is to extract it from your Windows 10 installation ISO or USB drive.
: On modern Windows 10 versions, even this package may sometimes request a connection to "download and install this feature" during setup. The DISM method above is more guaranteed for strictly offline environments. Important Considerations Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
: Insert your Windows 10 USB or right-click your Windows 10 ISO and select Mount .
If you see registry keys listed with an "Install" value of 1 , the installation was successful. To help troubleshoot or guide your next steps, let me know:
By using the tool along with your Windows 10 ISO file , you can easily overcome the limitations of the online installer, ensuring .NET Framework 3.5 is installed successfully on your 64-bit system, even without an internet connection.
: Enter the following command, replacing D: with your actual drive letter: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs Key Parameters Explained Installing .NET Framework 3.5 using offline ... - GitHub
Article last updated: October 2025 – verified for Windows 10 22H2 (64-bit).
is the smartest way to avoid update servers, broken internet connections, and corporate firewalls. While the online method often fails, using Microsoft’s official dotnetfx35.exe or extracting the sxs folder from a Windows 10 ISO guarantees success.
These errors indicate that the installer cannot find the source files or lacks permission to read them.
: Note the drive letter of the mounted media (e.g., D: ).
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