{"rewrite":{"id":"r_1cf3b1510a23d0f28a504504","clusterId":"c_893fd8347b6a596335191e41","slug":"windows-11-26h2-rollout-begins-with-enablement-package-to-build-26300-9457","model":"deepseek-v4-1-flash","headline":"Windows 11 26H2 Rollout Begins With Enablement Package To Build 26300.9457","summary":"Microsoft began distributing Windows 11 Ver.26H2 on September 29, 2026, pushing machines from 25H2 to 26H2 through an enablement package and on to OS build 26300.9457. Because distribution is random, some PCs have the notification and others do not. The author's own machines show the split, with one in regular use updated and others still waiting.","whyItMatters":"The staged, randomized rollout and the enablement package path mean most users will see the update arrive on Microsoft's schedule rather than their own, so the practical change this week is a version number, not a feature set.","webCardHtml":"\u003cp\u003eThe 26H2 enablement package moves a PC from 25H2 to 26H2, then the September 2026 D update takes it to OS build 26300.9550. The final 25H2 build, 26200.9550, shipped on September 22, a week before 26H2 arrived. On ARM hardware the same order applies, though the enablement package did not land immediately. Turning on \u0026#34;Get the latest updates as soon as they\u0026#39;re available\u0026#34; in Windows Update is described as raising the priority of distribution. Microsoft also lists known issues for 26H2, and updates may be halted on some configurations by a Safeguard Hold.\u003c/p\u003e","blueskyPost":"Windows 11 26H2 arrives as an enablement package, not a full download. That shrinks the install itself, but the staged rollout means identical PCs sit on 25H2 until Microsoft's random draw reaches them.","twitterPost":"Windows 11 26H2 ships as an enablement package, so the download is small. The random rollout order is what leaves identical PCs split.","threadsPost":"Windows 11 26H2 moves machines to build 26300.9457 through an enablement package, which keeps the download light. The part users feel is the rollout: distribution is random, so one PC in regular use updates while others wait on the same 25H2.","newsletterBlurb":"Windows 11 Ver.26H2 began rolling out on September 29, 2026, moving PCs from 25H2 to 26H2 by enablement package and then to OS build 26300.9550. Distribution is random, so some machines have the notification and others do not. Microsoft lists known issues for the release, and Safeguard Holds can pause delivery on affected hardware.","attributionJson":"[{\"source\":\"ASCII.jp\",\"url\":\"https://ascii.jp/elem/000/004/439/4439811/?rss\",\"title\":\"Windows 11 Ver.26H2 rollout begins - already the 5th major update, and attention is turning to what comes next!?\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":4825,"outputTokens":640,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1791186265,"createdAt":"2026-10-05T07:40:02.000Z","publishedAt":"2026-10-05T07:43:21.000Z","updatedAt":"2026-10-05T07:43:21.000Z"},"cluster":{"id":"c_893fd8347b6a596335191e41","canonicalTitle":"Windows 11 Ver.26H2の配布が開始　すでに5回目のメジャーアップデートで「次」も気になる頃合い!?","representativeArticleId":"a_d375543979b9dc720848a89e","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[\"Windows 11\"],\"studios\":[],\"people\":[],\"type\":\"release\",\"domain\":\"other\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-10-04T01:00:00.000Z","lastSeenAt":"2026-10-04T01:00:00.000Z","updatedAt":"2026-10-05T07:43:20.000Z"},"attribution":[{"source":"ASCII.jp","url":"https://ascii.jp/elem/000/004/439/4439811/?rss","title":"Windows 11 Ver.26H2の配布が開始　すでに5回目のメジャーアップデートで「次」も気になる頃合い!?"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":["Windows 11"],"studios":[],"people":[],"type":"release","domain":"other","is_roundup":false},"keyFacts":null}