www.itmedia.co.jp/pcuser/articles/2604/02/news123.html
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Windows 11（24H2／25H2）の3月オプション更新でインストールできないトラブル 「帯域外更新」で対処 - ITmedia PC USER
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About this page
This page reports on an installation failure issue with Windows 11's March optional update. Microsoft's KB5079391 update released on March 26 encountered error code "0x80073712" on some devices. In response, Microsoft released an out-of-band update KB5086672 on March 31, replacing KB5079391. For devices without KB5079391, KB5086672 will be installed instead. The updates include AI component improvements for Copilot+ PC, Narrator enhancements, Smart App Control improvements, Explorer bug fixes, and high refresh rate support.
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