Download the cab, download and extract this script: https://forums.mydigitallife.net/threads/windows-10-hotfix-repository.57050/page-105#post-1216064 and put the cab next to the .cmd and run the script.
Open ISO with winrar or 7zip (or mount) and go to "Sources\sxs" and extract "microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~x86~~.cab" or "microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~x64~~.cab".
On Admin CMD, go: DISM.exe /online /Enable-Feature /FeatureName:netfx3 /Source:X:\sources\sxs Replace X with your image drive
Holy s**t!!!! Guys my PC is getting • Feature update to Windows 10, version 1803, April update so fast but unfortunately I got a backlog of downloads to watch, delete, I only have 2 GB space left on OS drive atm, how much do space do I need/ free for upgrade?
2018-04 Cumulative update for Windows 10 Version 1803 (KB4135051) was re-offered for me today (2018-02-05). Is it the same or has it newer internal version?