有人说重置SMC可以解决这个问题，然而我没有试。最后看LOG，居然一堆连网错误，难道要校验checksum？
再到苹果官网上看到这个：
https://discussions.apple.com/message/33927150#33927150
- Hi,
- Had the same problem, but for me it worked by
- removing all DNS search domains
- untick the automatic proxy configuration
- for the Wifi adapter.
- good luck.
果然尝试。果然有效（最终发现还是有问题，终于。。重置NVRAM，安装完成）
网址：https://appletoolbox.com/2017/12/macos-could-not-be-installed-how-to-fix/
- 节选
- Next, let’s try out the basic NVRAM reset (or PRAM for older Macs) on your computer.
- Follow these steps if you are not sure about how to do the NVRAM reset
- Shut down your Mac
- Turn it on and immediately press and hold these four keys together: Option, Command, P, and R macOS Could Not Be Installed, How-To Fix
- Release the keys after about 20 seconds, during which your Mac might appear to restart
- Open System Preferences and check (and adjust, if necessary) any settings that reset, like volume, display resolution, startup disk selection, or time zone
- 说白了，就是启动的时候 cmd+option+P+R，等20秒。放开，再重启
一切都清静 了。只是感觉这一版，没什么变动的