Question: 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](https://superuser.com/questions/1120602/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](http://download.windowsupdate.com/d/msdownload/update/software/updt/2016/02/windows8.1-kb3138615-arm_49fc3757db0ee7183aeb101e5379614665058b06.msu). Also [stop Windows Update service like in Windows 7](https://superuser.com/a/1044548/174557) to avoid the hang at *"Searching for updates on this computer"* while trying to install the MSU.
Can you please describe step by step, how did you install the kb3138615? When I try to install the downloaded msu file, it creates a new folder in C:, which contains the following files:

Windows8.1-KB3138615-arm.cab

Windows8.1-KB3138615-arm.xml

Windows8.1-KB3138615-arm-pkgProperties.txt

WSUSSCAN.cab

and then the installation hangs at "Searching for updates on this computer". I do not understand the linked article how to avoid that.

I found some advice, how to install an update cab files so I restarted the tablet, then I launched Command Promt as an administrator and used the follovig command:

dism /online /add-package /packagepath:"C:\foldername\Windows8.1-KB3138615-arm.cab"

It seems the update KB3138615 is installed. 

Then I had to restart the tablet, run the Windows update troubleshooting tool and after another restart the Windows Update service started to work.

So it is OK now, but I am not sure about my installation method of the kb3138615. There is also the WSUSSCAN.cab in the folder and I didn't install it. Is it OK?

In any case I would like to know, how to install the KB3138615 msu file next time better way and avoid the hang at "Searching for updates on this computer".