When I create a new task Sequence I do not have the option"Upgrade an operating system from upgrade package".

I only get the options:

_Install an existing image package

_Build and capture a reference operating system image

_Install an existing image package to a virtual hard disk

_Create a new custom task sequence

I have added Windows 10 sources as "operating system Upgrade Packages"

I'm running SCCM 2012 R2 SP1 CU1

Can someone explain why I am missing this option or give me a clue where to search?

PS the Operating system upgrade package is deployed to the distribution points.

That option does not exist. You have to use http://blogs.technet.com/b/configmgrteam/archive/2015/06/16/revised-content-for-the-win10-in-place-upgrade-via-task-sequence-for-configmgr.aspx instead. 

The upgrade option is not as yet available in the console. This will be a feature of vNext. You will still need to import the Task Sequence that you download from MS.  What R2 SP1 does is add support for in-place upgrades to Win 10.

https://technet.microsoft.com/en-us/library/mt426642(v=vs.85).aspx

option not available as of yet. I assume you want to "refresh" or upgrade the OS on PC's already built. You can create a task sequence that will boot into WINPE and build the machine. Obviously this task sequence would need to be available or required to a advertised collection of your choosing. 

• Proposed as answer by Jason SandysMVP 16 hours 13 minutes ago
• Marked as answer by Xdaja 14 hours 3 minutes ago

I must admit I overlooked the fact that this task sequence option is only for SCCM Vnext.

But now I'm confused why the node "operating system installers" was changed to "operating system upgrade packages" after installing SP1. Is it correct to say that these cannot be used anywhere in SCCM?