D:\sources\sxs\ (assuming D: is your mounted ISO drive). 2. Installation via Command Line (Recommended)
You can also use PowerShell to download and install the .NET Framework 3.0 On-Demand Package CAB.
: Ensure the path points to the folder containing the file , not the .cab file itself. Verify that the account running the installation has full read permissions to that directory. WSUS Group Policy Interference D:\sources\sxs\ (assuming D: is your mounted ISO drive)
Usually means the server cannot reach the internet to download the file. Using the /source switch with the .cab file solves this.
Processing 1 of 1 - Adding package Microsoft-Windows-NetFx3-OnDemand-Package~31bf3856ad364e35~amd64~~6.3.9600.16384 [==========================100.0%==========================] The operation completed successfully. : Ensure the path points to the folder
The safest and most definitive way to obtain the microsoft-windows-netfx3-ondemand-package.cab file is directly from your original OS installation media: Installing .Net 3.5 on Windows 2012 R2 - Server Fault
Enable .
if (Test-Path $cabPath) Write-Host "Installing .NET Framework 3.5..." & dism /Online /Add-Package /PackagePath="$cabPath" /Quiet /NoRestart Write-Host "Installation initiated. Check with: Get-WindowsFeature NET-Framework-Features" else Write-Error "CAB file not found at $cabPath"