how to fix error windows 11 installation assistant 0xa0000400

Farhad Banaeian 0 Reputation points
2026-08-13T10:13:47.32+00:00

i want update windows 11

model laptop asus vivobook k513 2021

model os windows 10 21h2 ltsc iot

Windows for home | Windows 11 | Install and upgrade
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  1. Alvise Cervellati 6,875 Reputation points Independent Advisor
    2026-08-13T11:11:17.4533333+00:00

    Hi @Farhad Banaeian , welcome in community

    Do you have enough room on your disk? Press WIN+ R and type

    Cleanmgr

    Now follow the instructions on screen. So disconnect from internet and retry

    You can also download an iso from here

    https://www.microsoft.com/en-gb/software-download/windows11

    Mount the iso e run from here the upgrade, be sure to keep program app and personal files

    Let me know

    Elvis

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