I have tried for many days, but I still cannot download flarum in composer. I successfully installed flarum by running the following command and modifying the composer source.
（我试了很多天，但依然没办法通过composer下载flarum，通过运行以下命令，修改composer源后，成功地安装了flarum，如果有需要的中国用户，切记哦！）
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer
here we go:
(修改源后就可以开始安装了）
composer create-project flarum/flarum . --stability=beta
For more installation details:
https://t.tmtd.cn/d/12-iis-windows2012-r2-flarum
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