Hey community :)

I am building an Windows app for personal use to 'build' my own Windows 10 ISO files. In this app, I am adding the ability to download updates packages and add them to WIM file using WAIK tools. My question is not about coding, I just would like to understand the "cumulative" updates that have been released, and which one I need to download.

First off all, I would like to talk about the POST-RTM updates that were released till sign-off at July 29th. My idea is simple. The Windows 10 that was released at 29th July is Windows 10 RTM + updates released till sign-off

This is the list, all of them are Security Updates

• KB3074674 (Security Update for Windows 10)
• KB3074679 (Security Update for Windows 10)
  
• KB3074680 (Security Update for Windows 10)
  
• KB3074681 (Security Update for Windows 10)
  
• KB3074682 (Security Update for Windows 10)
  
• KB3074683 (Security Update for Windows 10) (latest)

I have read all documentation about these updates.. The summary is the same for all, so now I am wondering if they are cumulative? If YES, that means all I need is to grab the latest package KB3074683? The documentation is not clear at that point...

Now, about the updates released Post Sign-off till today... This is the list of the Cumulative Updates

• KB3081448 (latest)
• KB3081444
• KB3081438
• KB3081436
• KB3081424

According with their documentation 

"Windows 10 updates are cumulative. Therefore, this package contains all previously-released fixes (see KB 3081XXX). If you have installed previous updates, only the new fixes that are contained in this package will be downloaded and installed to your computer."

To conclude, all I need is the package KB3074683 and KB3081448 and other Dynamic updates?

[sorry if this is on wrong

To conclude, all I need is the package KB3074683 and KB3081448 and other Dynamic updates?

Your approach seems reasonable but wouldn't it be easier to use MSFT's Media Creation Tool to generate the ISO's?

My understanding is that the Tool is revised periodically to include recent updates.  ISO's I created with the tool on 7/29 were build 10.0.10240.16399 released on 7/22 and those I created with the tool on 8/29 were build 10.0.10240.16480 released on 8/19.

• Proposed as answer by MeipoXuMicrosoft contingent staff, Moderator 15 minutes ago

Maybe it would, but I am bit tired of "Something happened..." error messages :)

This is also a way to explore and learn a bit more about coding.

Well, that is interesting. Never though Media Creation Tool includes updates, but according with your revision build information that's true, because when RTM was released, it was 16384

Thanks for your information, but I would like to see if anyone can confirm my approach :)

Hi Fbio DanielR,

Personally I would prefer John`s suggestion to work with the Media Creation Tool.
As for your method, a easy way to confirm this is to check the update files version.
According to my understanding, these updates are used to update these files.  Usually we should only get the latest one.
For example:

Best r