Windows 10 Build 10162 upgrade fails at 40%

Windows 10 Build 10162 upgrade fails at 40%:

For many attempting to upgrade to Windows 10’s official build 10162, the  upgrade is failing at 40%. If you try to upgrade, you’ll get this issue. However, a clean install is working properly. After initiating the update, it’ll reboot to the installation screen and fail with an error asking you to revert to previous windows. Once you revert, you’ll be welcomed with something like this:

Windows 10 Build 10162 upgrade fails at 40%

Windows 10 failing to upgrade

Also, attempting upgrade from within Windows 8x, you’ll run into an error like so:

Windows 10 Build 10162 upgrade fails at 40%

Windows 8.1 failed to update

Windows 10 Build 10162 upgrade fails at 40%

Error message with no help


The reason is the selection of a particular component on existing Windows 8.1/10 installation: Microsoft .Net Framework 3.5.

Windows 10 Build 10162 upgrade fails at 40%

Windows features with Microsoft .Net Framework 3.5 turned off

If you have Microsoft .Net Framework 3.5 enabled in Windows Features, you will not be able to proceed with the upgrade. This feature is either enabled by you or by some application that you installed. For me, I enabled it as I’m a developer. Also, applications like Paint.Net requires this framework. Similarly, games like Elite Dangerous requires it as well. Bottom line: there is a very good chance you will have Microsoft .Net Framework 3.5 enables one way or another.

You need to uncheck it in order to proceed with upgrade of Windows 10 Build 10162. You can access the “Windows Features” by searching (type it:) windows features while start menu is open or you can go to Control Panel -> Program and Features -> Turn Windows features on or off

Windows 10 Build 10162 upgrade fails at 40%

Access Windows Features

If you turn it off, you might get a warning. Ignore that and continue with upgrading to Windows 10 Build 10162. You can open a downloaded ISO file and run setup. Or you can get the update from windows update. Either way, it’ll succeed.

The issue was found by user Manuet on the Microsoft Answer site’s thread: 10162 installation fails at 40%


  1. Merv-Reply
    October 23, 2015 at 7:07 am

    I got a msg that something was wrong and Microsoft would reboot, which it did, and then continued until the screen froze at 40% installed (Installing features and drivers 23%), which was still froze a half hour later when I closed the lid and came to a different location to use a different pc.
    Guessing by your msg, when I return to the frozen W10, I do a hard boot and hope it will boot again in W7.
    Thanks for the info, but Microsoft would be more user friendly if they had their install program check for the Microsoft .Net Framework 3.5 conflict and correct it rather than making the user go online to correct their oversight.
    I’ve two more pcs but can’t have them out of commission if W10 makes a mess of things. One guinea pig at a time.

    • October 27, 2015 at 10:20 pm

      That’s the beauty of beta builds. Microsoft never guaranteed they’ll work. In fact, they told NOT to test them unless you want to test them to see when and how they fail.

      • Merv-Reply
        October 28, 2015 at 3:38 am

        With “More than 110M people have already upgraded to Windows 10 – FREE!” and a big push to get everyone to install it, one might think that the product was beyond the pre-release trial period.

        More to the point, when I returned the next day and opened the lid, the screen came on with a welcome message and an instruction to click in the designated place to continue the installation, which I did. An hour later it appeared to again be in deep thought, or a stupor, and I again closed the lid and went away for a couple days. Upon returning and opening the lid, surprise!, it displayed a welcome to Windows 10 message and then the Windows 10 desktop.

        I can say one thing about Windows 10, the installation process was like none I’ve experienced before. Windows Explorer now has a directory named Old Windows, which includes a Favorites subdirectory. I have yet to invest hours in the perpetual retraining process, find the Favorites or the Favorites bar.

        Upgrades, like the tax code, create millions of hours of work and therefore must be good for the economy.

Leave A Comment