nvm 下载node 下载不下来_nvm下载node时无法下载npm

使用nvm下载node后报错 提示程序被占用 然后node_modules文件夹为空

C:\Users\Administrator>nvm uninstall 8.12.0

Uninstalling node v8.12.0... done

C:\Users\Administrator>nvm install 8.12.0

Downloading node.js version 8.12.0 (64-bit)...

Complete

Downloading npm version 6.4.1... Download failed. Rolling Back.

Rollback failed. remove C:\dev\nvm\temp\npm-v6.4.1.zip: The process cannot access the file because it is being used by another process.

Could not download npm for node v8.12.0.

Please visit https://github.com/npm/cli/releases/tag/v6.4.1 to download npm.

It should be extracted to C:\dev\nvm\v8.12.0

文件夹里没有npm命令

镜像地址也改过了

root: C:\dev\nvm

path: C:\dev

arch: 64

proxy: none

node_mirror: http://npm.taobao.org/mirrors/node/

npm_mirror: http://npm.taobao.org/mirrors/npm/

求大神给个解决办法