dart sdk下载不下来 里面文件是空的

[zhou87]

Downloading Dart SDK from Flutter engine 5d8bf811b3072390933d69f3e289a4bb673636c4...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 153 100 153 0 0 14 0 0:00:10 0:00:10 --:--:-- 35
[/Users/xxx/Library/Application Support/fvm/versions/2.0.2/bin/cache/dart-sdk-darwin-x64.zip]
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of /Users/xxx/Library/Application Support/fvm/versions/2.0.2/bin/cache/dart-sdk-darwin-x64.zip or
/Users/xxx/Library/Application Support/fvm/versions/2.0.2/bin/cache/dart-sdk-darwin-x64.zip.zip, and cannot find /Users/xxx/Library/Application Support/fvm/versions/2.0.2/bin/cache/dart-sdk-darwin-x64.zip.ZIP, period.

It appears that the downloaded file is corrupt; please try again.
If this problem persists, please report the problem at:
https://github.com/flutter/flutter/issues/new?template=ACTIVATION.md