So what happens? Nothing. Windows 10 Home or Pro is installed, and you can use it. There are just two limitations that I have come across:1. Watermark on the lower right-hand corner saying Activate Windows2. You cannot use anything under Personalization e.g. change wallpaper, accent colors, lock screen, themes, etc. All options are there, they are just grayed out and inaccessibleOther than this you have a fully-functional Windows 10 OS. There are no nag prompts either and yes, you get all system updates (at least for the year).
參考網站：You do not need to Activate Windows 10 to install it, but this is how you can activate later
答案是不啟用也可以正常使用，但是有一些功能會受到限制
在螢幕右下方會有啟用windows的水印你無法進行個性化修改，例如修改桌布、顏色、鎖屏、主題等，這些修改按鈕都會變成灰色。你無法使用微軟賬號的同步功能，例如在不同的微軟裝置上同步設定實際上你獲得是接近有完整服務的win10系統，而且win10也會更新。
至於其他答案或者是百度到的電腦時不時卡頓都是瞎扯，或者是沒有選擇在微軟官網下載win10安裝包而使用了其他奇奇怪怪的途徑。
這件事情告誡了我今後要多用google，多用英文搜尋......遠離不靠譜網站
原文
So what happens? Nothing. Windows 10 Home or Pro is installed, and you can use it. There are just two limitations that I have come across:1. Watermark on the lower right-hand corner saying Activate Windows2. You cannot use anything under Personalization e.g. change wallpaper, accent colors, lock screen, themes, etc. All options are there, they are just grayed out and inaccessibleOther than this you have a fully-functional Windows 10 OS. There are no nag prompts either and yes, you get all system updates (at least for the year).參考網站：You do not need to Activate Windows 10 to install it, but this is how you can activate later
本回答寫於20171120，微軟今後的“政策”可能有變，請留意微軟官方資訊