Sierra installation failed.

1, go to the relevant website to download macos.

Sierra's dmg file. (For example, Wei Feng. Com forum)

2. load the dmg file.

3. copy. Application to application folder.

4. Open the one you just copied. App file in the application. Just follow the instructions of the installation program.

Note: The above installation process does not require a developer account.

Maybe there was something wrong when I downloaded it. I downloaded it again. The system has just been upgraded, and there is no problem in downloading, but the database is scrapped after installation. Maybe it's because I installed bower later and configured bootstrap, but there was a node problem. We all installed it ~