Windows 10 Technical Preview //Build 10061


After some weeks of Windows 10 leaked versions, finally Microsoft released a new build for Windows Insiders. The latest official build is 10061 which brings some new features, specially in user interface, and of course, some bug fixes and new features. You can download this Fast Ring build directly from Windows Update, but if you are looking for a new and fresh installation, I have caught the Windows Update Server links for English (US), both Enterprise and Pro versions. Note that the files on Microsoft Database are ESD encrypted so you will need some additional work to convert it to ISO file, but in this post you will also find an explanation. While Microsoft don’t push this new build, 10061, to Slow Ring, this is the only way.
By the way, is notable that on Microsoft ESD log entries, we can already see the build 10.0.10073.0
(now nominated as Canary Ring). Unfortunately, this is not available for download yet. This build was added 24th April, while build 10061 is quite old, added 12-14th April.
On the other hand, Microsoft annual Build conference is from 29th April to 1st May, so we can expect good news and probably new builds for Windows 10, also for Phones

//Build Download

Here is the table which contains both Enterprise and Pro versions for both CPU architectures: x86 and x64, also earlier builds are available in the table. Note that for the build 10049, the links on Windows Update Server are broken, but I have found an alternative which you can see below. In addition, note that some builds will stop booting already in 30th April. Check the picture below


*ISO file
**ESD File
***Officially not released by Microsoft

Windows Build x86 x64
9926* Technical Preview Technical Preview
10041* Pro Pro
Enterprise*** Enterprise***
Check below
10051* (leaked) Pro***
10056* (leaked) Pro***
10061** (modified RSA) Pro Pro
Enterprise Not available
10061* Pro Pro
Not available Not available

Note: When trying to decrypt ESD files available on Windows Update Server I face an error because the RSA keys are not the same as previous builds. Fortunately, I have found ISO from third party!

˅ Build 10049
˄ Build 10049

It seems the ESD files have been moved to a different directory in Windows Update Server, so they are not working anymore. Fortunately, I have found a folder filled with various options of ESD files in a Mega Storage.
The link is here

Now the question might be: Which one should I download?

Number Description
1 10049 Pro x86
2 10049 Pro x64
3 10049 Enterprise x86
4 10049 Enterprise x86



˅ Build 10061
˄ Build 10061

What’s new?

  • New Mail and Calendar apps: These new apps bring improved performance and a familiar three-pane email UI, with a toggle to quickly move between your email and calendar. Mail includes customizable Swipe Gestures, letting you swipe right or left to take actions like delete, flag, move or mark as read/unread. Also check out the new email authoring experience. Mail leverages the familiar and rich capability of Word to that allows you to easily insert tables, add pictures and use bullets and color to your text. Both the new Mail and Calendar apps support Office 365, Exchange,, Gmail, IMAP, POP and other popular accounts.
  • Start, Taskbar, and Action Center improvements: This build introduces the new black system theme across the Start menu, Taskbar, and Action Center. The Start menu and Taskbar now have transparency and you can also resize the Start menu. Microsoft also enabled support for AutoColor which pulls the primary color from your desktop background. In the Settings app under Personalization, you can adjust the color of Start, Taskbar, and Action Center as well as transparency. Check these settings out and let us know what you think. And based on your feedback, Microsoft has have moved the power button to the bottom left from the top right of the Start menu to make it more accessible.
  • Continuum improvements: The Taskbar is now more optimized for tablets. Entering Tablet Mode causes the Start button, Cortana, and the Task View buttons to all grow in size and space out to be more touchable. Items in the Notification area also widen to improve touchability. Also, pinned and running apps are removed by default to reduce clutter and simplify the experience. Start and Task View remain available for launching and switching. If you still prefer to see apps on your taskbar, there is an option under Tablet Mode in Settings to turn them back on. Window 10 also now offers a setting to boot directly into Tablet Mode. For tablets under 10 inches, this is the default behavior.
  • Task View improvements: Microsoft made several visual updates to Task View and they also refined the window icons, the close buttons, and the thumbnails. These improvements also apply to Alt+Tab and Snap Assist. Task View gets a new icon on the Taskbar too.
  • Virtual Desktop improvements: You can create as many Virtual Desktops as you’d like! When you hit the limit of your display, a new overflow experience now lets you access any one of your desktops.
Known issues


  • We know this one will be a bit painful but there is a bug with this build in which Win32 (desktop) apps won’t launch from the Start menu. The workaround is to use search to find and launch these apps and pin them to your taskbar for quick access.
  • The Windows Store Beta (grey tile) and Project Spartan get unpinned after upgrading. You can re-pin them to your Taskbar from All apps on your Start menu.
  • The version of the Mail and Calendar apps included in this build (17.4008.42281.0) have a known issue that causes every typed letter to appear twice. Which might be funny if it weren’t so irritating. We have fixed this issue with updated versions of the apps (17.4016.42291.0) available in the Windows Store Beta (grey tile). If you don’t open the Mail and Calendar apps within the first 15 minutes after logging in to your device for the first time after upgrading and your device is connected to the Internet, the apps should update automatically. You can also go into the Store Beta and check for updates manually at any time.
  • Cortana will highlight things it will be able to help users with, but some of these features are not yet implemented and we are working to deliver them soon.
  • There is a known issue where you might see a black screen with only your mouse cursor during login/logout. We have a fix for this coming via WU.
  • Downloading music in the Xbox Music and Music Preview apps is currently broken. We also have a fix for this coming via WU.
  • When you minimize an app playing audio, it may stop playing once its minimized.
  • In Project Spartan, no selection highlight appears when selecting text in the address box. You can right click in the address box to cut/copy/paste and it will work as expected. We also have a fix for this coming via WU.
  • Magnifier does not work when you put it into docked mode. We will also have a fix for this coming via WU.


˅ How to create ISO from ESD encryption
˄ How to create ISO from ESD encryption

After you get the .esd file, you must download this tool which allow you to convert .esd to .iso files
Extract the files, right-click over file decrypt.cmd and run as administrator. 

Paste the path where ESD file is + file name
In my case:
Tip: Move the ESD to a easy location like C: and rename it for easier access


A new script will pop-up, select option 1
Let the tool complete it’s job

Grab your ISO file and install Windows 10!

Windows 10 Build Pro Enterprise Technical Preview 9926 10041 10049 ESD files ISO convert 10051 download how to 1056 10059 10060

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.list {display:none; }
.show {display: none; }
.hide:target + .show {display: inline; }
.hide:target {display: none; }
.hide:target ~ .list {display:inline; }
@media print { .hide, .show { display: none; } }

<!–table_ need improvements

table, th, td {
border: 1px solid #c3d9ff;
border-collapse: collapse;


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