Microsoft Releases Windows 10 Build 10240 “RTM” Sorta

Microsoft today started rolling out what some are calling the “RTM” of Windows 10 today to both slow and fast ring Windows Insiders.

Windows 10 Hero - Copy - Copy smallMicrosoft today started rolling out what some are calling the “RTM” of Windows 10 today to both slow and fast ring Windows Insiders. You can download it now via Windows Update.

According to Gabe Aul’s post on Blogging Windows: “Over the past few days we’ve been preparing our release pipelines and processes, and this build is one step closer to what customers will start to receive on 7/29.”

Microsoft has stopped making new builds, and has not officially declared this the RTM. But, instead the company is making update packages for this build, 10204.

This information comes from a trusted source inside the company and which Paul Thurrott wrote about. This is how Paul explains it in a recent post on his site

First, a quick peek behind the curtain: a trusted source at Microsoft has told me that the software giant has not signed off on Windows 10. That said, it has also stopped building new builds and is now busy building update packages for build 10240. Which suggests that Microsoft might not even declare RTM as they have in the past—i.e tie it to a specific build—but could instead declare RTM as this build plus certain critical updates.

Notice in the screenshot below that this build is called TH1 Core 10240 – which we assume stands for the “Threshold” codename for the OS.

While Microsoft is not officially calling this the RTM (Release to Manufacturing) it is in fact what will be going out to various vendors like Dell, Lenovo, etc.

However, from now until the actual release date on the 29th (and beyond), more updates and features will continue to be added.

Apparently there will not be ISO versions available for this version, but they should be coming after the official release.

We’re just downloading it now, and will let you know as soon as we are able. If you are an Insider, download the new build, and let us know how it goes for you in the comments below.



  1. Adam

    July 15, 2015 at 1:20 pm

    what is it for the update ?????????????

    • Adam

      July 15, 2015 at 1:21 pm


  2. JP

    July 15, 2015 at 2:14 pm

    Install seems to hang at 23% on screen “Preparing to install updates”

    Anyone else experiencing this issue. Other OTA updates have been successful. Currently running build 10166.

    • Brian Burgess

      July 15, 2015 at 2:37 pm

      I would imagine servers are getting slammed. How long has it been hanging?

      I had a similar problem with 10166 when it came out. It hung at 0% 3 reboots, and 1 full system shutdown did the trick.

      • JP

        July 15, 2015 at 6:04 pm

        It appears it was the servers getting overloaded. All is well now, as after a reboot it gave the error code 0x8024001e. I then rebooted again, it gave an “Install Now” button, and installed fine.


    • JMP

      July 16, 2015 at 11:02 pm

      It does take a long time but guess what is gone besides the watermark? no more expiration date :)

  3. Scott Chamlee

    July 15, 2015 at 6:31 pm

    Had no issues downloading or installing. Scott C.

  4. Bill McLaughlin

    July 16, 2015 at 8:22 am

    I was able to get the TH1 Build 10240 to update on a Build 10166 that I did with a clean install. However, I can’t find a valid product key for activation.

    Any suggestions?

  5. JMP

    July 16, 2015 at 11:05 pm

    It may take up to a few days sometimes. Mine activated right away call me lucky lol.

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