Windows+R，輸入cmd打開命令行
在命令行中輸入pip install pyinstaller
運行命令之后如果安裝成功那么會出現：Successfully installed pyinstaller-x.x.x
如果報錯：WARNING: You are using pip version 20.1.1; however, version 20.2.3 is available.
解決方法：使用 python -m pip install -U --force-reinstall pip 升級成功
然后就會出現安裝成功的提示：Successfully installed pyinstaller-x.x.x
若仍無法安裝，那么請參考https://blog.csdn.net/weixin_30483495/article/details/95153992