我安装了zeromq并开始使用 npm install -g bitcore 安装bitcore，但是出现了一些错误：
npm WARN deprecated json3@3.3.2: Please use the native JSON object instead of JSON 3
> bitcore-node@3.1.3 preinstall C:\Users\karthik\AppData\Roaming\npm\node_modules\bitcore\node_modules\bitcore-node
> ./scripts/download
'.' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! bitcore-node@3.1.3 preinstall: `./scripts/download`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the bitcore-node@3.1.3 preinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.