Windows 8.1 RT keep searching for update after installation of KB2919355 April 2014 Update 1

I have a tablet that run Windows 8.1 RT. I did a restore few days ago then I started do the updates availables in Windows Update. After a few Update/Reboot cycles, KB 2919355 April 2014 Update 1 was installed and now Windows Update keep searching for update forever. I've tried everything I found on the net to fix this (Windows Update Troubleshooter, stop the service / delete c:\Windows\SoftwareDistribution folder, etc.) but I can get this fixed.

I found two similar posts for Windows 8.1 with accepted answer that suggest to install KB3102812:

1. Cannot install any updates on clean Windows 8.1


2. https://answers.microsoft.com/en-us/windows/forum/windows8_1-update/windows-81-windows-update-stuck-at-checking-for/c0d42129-7479-44cb-a150-a95ad707ab2b

However, the tablet run Windows RT and KB3102812 page (https://support.microsoft.com/en-us/kb/3102812) state that :

The update for Windows RT 8.1 can be got only from Windows Update.

The update is also not available on the Windows Update Catalog for ARM architecture.

Does anyone has a suggestion to fix this Windows Update issue or any hint where I could go to download the KB3102812 for RT?

EDIT

I now know from Microsoft Support that installing KB3138615 should fix the issue but I still can't find a link to manually download this update for ARM devices.

Answer

You can download the update kb3138615, which includes the latest Windows Update Agent, from this link. Also stop Windows Update service like in Windows 7 to avoid the hang at "Searching for updates on this computer" while trying to install the MSU.