Installing Net Framework 3.5 in Windows 10 S

You'll need the correct flavor of Windows ISO, 32/64, but this command does work. I've used it myself.

Dism /online /enable-feature /featurename:NetFX3 /All /Source:\sources\sxs /LimitAccess

Editor here turns ":" into a smiley, look in the article.
Source: Offline install of .NET Framework 3.5 in Windows 10 using DISM

FreeBooter said:

Dism command tool is included with Windows 10 Pro ISO image you can open the command prompt and execute Cd /d X:\Sources and execute Dism from Windows 10 Pro ISO image.

ok...point was it's possible to install the .net 3.5 from an ISO.

...it will have to be something like this then?
DISM /Image:C:\Windows /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:X:\sources\sxs

FreeBooter said:

That command can be use from Windows Recovery Environment not from booted online Windows OS.

Well yah!, We can't run commands within the online image in Win 10S.

FYI: Changing to Pro has no effect on apps - still has the restrictions. This is really a crap edition.

FreeBooter said:

Does the Windows 10 10S have a Command Prompt?

Yup but it's blocked within Windows itself...

One can get to it via Advanced options tho...(WinRE.)