无法使用Windows PowerShell安装Jupyter Notebook，因为pip不会升级到20.1版

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enter image description here I'm following this video to install Jupyter Notebook using Windows PowerShell. I entered the scripts folder and type .\pip install jupyter, and then it suggested uploading pip to version 20.1 first. Well, I typed python -m pip install --upgrade pip as suggested, but nothing happened. If I tried to install Jupyter Notebook again, it would just start a circle once again.

I also tried .\pip3 install jupyter as some other thread online says. And doing all these in the Python folder (one level up) but everything is the same.

为什么会这样？安装Python 3.8最新版本的pip时，我得到的不是吗？现在如何实际将其上传到20.1版？

BTW, this is what my Scripts directory looks like now: enter image description here

enter image description here