KB4601382 CU Windows 10 v2004 build 19041.844 and v20H2 19042.844

Wolfzz · 25 Feb 2021

First combined LCU/SSU update hits general release

In December and January, Microsoft allowed enterprises and consumers to test these combined LCU/SSU updates through the Windows Insider program.

Microsoft also advised that they would release these combined updates to the general release channel starting in February. To prepare for this release, Microsoft pushed out a standalone SSU (KB4598481) that allows for installing the combined package.

Today, Microsoft released the Windows 10 2004/20H2 optional KB4601382 cumulative update preview via Windows Update.

With this release, Microsoft delivers the first combined LCU/SSU update to the general public via Windows Update.

"Starting with this release, Microsoft will combine the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). To utilize this improvement, install the most recent standalone SSU (KB4598481) before installing this LCU," Microsoft announced.

As this combined package needs to have the KB4598481 SSU update installed already if it is not and you try to uninstall this cumulative update, you may receive the following error:

0x800f0823 – CBS_E_NEW_SERVICING_STACK_REQUIRED

If you receive this error, simply close the dialog and install the KB4598481 SSU before trying again.

therealdalegrib · 25 Feb 2021

just updated mine no issues other than the 22 hang time.

Fabler2 · 25 Feb 2021

Sfc required reboot.

KB4601382 CU Windows 10 v2004 build 19041.844 and v20H2 19042.844-screenshot_3.png

lintern · 25 Feb 2021

Just got this update now. Thanks.

ddelo · 25 Feb 2021

IronZorg89 said:

Earlier this morning, I checked for updates on my production machine on 20H2 and got nothing. Later on, I rechecked for updates and I got three updates:
-KB4601554 for .Net Framework
-Security Intelligence Update
-KB4601382 CU in optional Update

My main problem was why MS asked me to "Restart" while there was still a download in progress. Never seen it before.

You were asked to restart, because the .Net KB4601554 had finished installing and it needed to complete its installation process. The fact that you were still downloading another update (KB4601382 CU) and you hadn't finished your entire update process is irrelevant to the Redmond geniuses that have implemented this function.

To make a long story short, DO NOT restart, before every installable item has finished, regardless of the number of "Restart" notifications you get. That simple!

f14tomcat · 25 Feb 2021

DaveH1 said:

Off-topic, but I also just got the supposedly preview .NET update KB4601554 pushed to me, and not as an optional update.
This is exactly what happened last month.
Sorry, either these updates are previews or they're not, and if they are they should not be being pushed out like final released updates!

catspyjamas said:

Well after downloading & installing KB4601382 on five laptops this morning, on all of them, this .NET framework update was already well and truly in the process of downloading and installing the KB4601554 (Cumulative Update Preview for .NET Framework 3.5 and 4.8 for Windows 10 20H2 for x64) immediately after logging in from the reboot. Infact on one of them, it was waiting for a restart for it already. The latter was not showing as an optional update prior to this, so in that sense, yes it was pushed on users (in spite of the name MS gave it). The name suggests it might be optional like other updates where MS use the word "Preview" in the name.

Myself, I'm not upset that it was downloaded and installed automatically, just sharing my experience because it validates what the user above said about it being pushed on them.

Perhaps it is because it's installation is contingent upon one choosing to download and install KB4601382 in the first place?

I'm beginning to believe the term "Preview", when applied to the .Net updates, is a misnomer. The fact they come out during the "C" and/or "D" monthly channel may indicate they are necessary (Pre-req) for this Preview CU and/or the Patch Tuesday version if this CU is not applied now. They are part of the Windows programing language library and may need to be updated in any case.

DaveH1, I may have misinterpreted your post.

DaveH1 · 25 Feb 2021

No problem! I think that an update which installs when you do an update check, even if it doesn't install automatically with no user action, is being pushed, and it can't be considered to be optional.
There's many reasons why you might want to do a manual update check, looking for drivers for a new piece of hardware being an obvious one, and you shouldn't be getting supposedly "preview" updates installed as a result of that!
Maybe you're right, and the .NET updates in question aren't actually previews.
There have been some which don't seem to have been subsequently replaced by release versions, which would bear this out.

f14tomcat · 25 Feb 2021

DaveH1 said:

Np problem! I think that an update which installs when you do an update check, even if it doesn't install automatically with no user action, is being pushed, and it can't be considered to be optional.
There's many reasons why you might want to do a manual update check, looking for drivers for a new piece of hardware being an obvious one, and you shouldn't be getting supposedly "preview" updates installed as a result of that!
Maybe you're right, and the .NET updates in question aren't actually previews.
There have been some which don't seem to have been subsequently replaced by release versions, which would bear this out.

Many have used WUMT just for that purpose, checking for drivers or anything, without getting caught in the snare. Works beautifully.

DaveH1 · 25 Feb 2021

Indeed, I have used WUMT myself, although not on Windows 10.
A non-technical user wouldn't know about that though.
Incidentally, another indication that the .NET updates in question are in fact previews is that they end up in the "Other Updates" section of the installed updates list on the Windows Update interface, not in the main section, so it's not just the naming of them that's wrong, they must be actually flagged as previews.

IronZorg89 · 25 Feb 2021

ddelo said:

You were asked to restart, because the .Net KB4601554 had finished installing and it needed to complete its installation process. The fact that you were still downloading another update (KB4601382 CU) and you hadn't finished your entire update process is irrelevant to the Redmond geniuses that have implemented this function.

To make a long story short, DO NOT restart, before every installable item has finished, regardless of the number of "Restart" notifications you get. That simple!

I know now not to "Restart" until everything is over. Other member @DaveH1 has given me the same advice. I think I have learned my lesson the hard way.