根据这篇新闻报导
https://www.computerworld.com/article/3268473/microsoft-windows/
what-happened-to-the-new-spring-update-windows-10-version-1803.html
有个负责发布消息的小编推特
https://twitter.com/zacbowden/status/983833624259768322
found a blocking bug over the weekend that was bad enough to hold the release.
Not sure if bug was fixed in 17133.73 or if it'll come in another patch.
RS4 will likely begin rollout in a couple weeks now.
也就是说，目前网络上找到的 ISO 版本应该是 17133.1
目前最新版本是 17133.73 但上周末似乎被找出臭虫问题，不太确定是否已修正？
所以微软延迟发布更新了
大概两个礼拜内会正式发布更新