.NET Framework 3.5 offline Installation

Windows 10 ISO entpacken und “sources” Ordner in Share ablegen

DISM /Online /Enable-Feature /FeatureName:NetFX3 /All /Source:"\\Pfad\zur\share\sources\sxs" /LimitAccess

Alternativ Cab-Files installieren

DISM /Online /Add-Package /PackagePath:"C:\sxs\microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab"
DISM /Online /Add-Package /PackagePath:"C:\sxs\Microsoft-Windows-NetFx3-OnDemand-Package~31bf3856ad364e35~amd64~de-DE~.cab"

Untested

Enable-WindowsOptionalFeature -Online -FeatureName 'NetFx3' -All
Add-WindowsCapability -Online -Name NetFx~~~~ -Source C:\Windows\Temp\dotnet -LimitAccess