Install .NET framework 3.5 offline (really offline) without internet access

Question

some old apps need .NET 2.0 and 3.0

You can use DISM: Deployment Image Servicing and Management (DISM) to add .NET Framework 3.5 and provide access to the \sources\SxS folder on the installation media to an installation of Windows that is not connected to the Internet.

prerequisite:

Installation media
Administrator user rights.

Open a command prompt with administrator user rights (Run as Administrator).
To install .NET Framework 3.5 from installation media located on the D: drive, use the following command:

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs

redxps630 · Answer

well I tried the above command line but kept getting DISM does not recognize command line option of Source:d:\sources\sxs.

(I forgot to add a / in front of Source)

so try this:

copy paste the microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab in the D:/sources/sxs folder to C:\ which is root path of C: drive

dism /online /enable-feature /featurename:netfx3 /all /source:c:\ /limitaccess

redxps630 · Answer

I verify the above works in Windows 10 22H2 and Windows 11 25H2.  after DISM reports success, the app installation does not ask for download/install .NET.

redxps630 · Answer

Microsoft .NET Framework 3.5 service pack 1 is a cumulative update that contains many new features building incrementally upon .NET Framework 2.0, 3.0, 3.5, and includes .NET Framework 2.0 service pack 2 and .NET Framework 3.0 service pack 2 cumulative updates.

Download Microsoft .NET Framework 3.5 Service pack 1 (Full Package) from Official Microsoft Download Center

direct DL link https://download.microsoft.com/download/2/0/e/20e90413-712f-438c-988e-fdaa79a8ac3d/dotnetfx35.exe

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Install .NET framework 3.5 offline (really offline) without internet access

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