有关置底的这个问题
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Q5: 我在7月29日之前如果没有预约升级，7月29号之后怎么办？
A5: 微软客服表示目前相关升级资讯以官方网页说明为主，所以没有相关讯息可以先
为我做说明....
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我闲闲没事去看英文FAQ
http://www.microsoft.com/en-us/windows/windows-10-faq
有这一段
Can I get my free Windows 10 upgrade even if I didn’t reserve?
Yes. The easiest way to get the free upgrade is to reserve, but you can
upgrade even if you don’t reserve.
Once Windows 10 is available, we’ll begin notifying devices that their free
upgrade is available. Just open the Get Windows 10 app to schedule your
upgrade. Note: Some notifications will go out as soon as Windows 10 is
available; others may go out in the weeks or months following.
有人有兴趣翻吗?
此外我不能保证如果你没事先预约发生的任何损失喔!