根據這篇新聞報導
https://www.computerworld.com/article/3268473/microsoft-windows/
what-happened-to-the-new-spring-update-windows-10-version-1803.html
有個負責發布消息的小編推特
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.
也就是說，目前網路上找到的 ISO 版本應該是 17133.1
目前最新版本是 17133.73 但上周末似乎被找出臭蟲問題，不太確定是否已修正？
所以微軟延遲發布更新了
大概兩個禮拜內會正式發布更新