不要将打包的输出路径设置为Assets文件夹下面即可，MD真坑

老外给出的解释:

SRE实战 互联网时代守护先锋，助力企业售后服务体系运筹帷幄！一键直达领取阿里云限量特价优惠。

As you have noticed after you click build settings you are prompt to download it in the asset, which unity wouldn't allow to build exe files inside asset. in that case, try building it in a different folder or in desktop. It works fine for me! :D

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