I had this issue as well and for me installing pip packages with python -m pip install <package>
worked. So python -m pip install --upgrade pip==20.2
should work for you.
See here:
(rasa) C:Users<user>>pip install --upgrade pip==20.2
Collecting pip==20.2
Downloading pip-20.2-py2.py3-none-any.whl (1.5 MB)
|████████████████████████████████| 1.5 MB 6.8 MB/s
Installing collected packages: pip
Attempting uninstall: pip
Found existing installation: pip 20.3.3
Uninstalling pip-20.3.3:
Successfully uninstalled pip-20.3.3
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'C:\Users\<user>\AppData\Local\Temp\pip-uninstall-qmjwuv0x\pip.exe'
Consider using the `--user` option or check the permissions.
(rasa) C:Users<user>>python -m pip install --upgrade pip==20.2
Requirement already up-to-date: pip==20.2 in c:users<user>appdatalocalcontinuumanaconda3envs
asalibsite-packages (20.2)
WARNING: You are using pip version 20.2; however, version 21.0 is available.
You should consider upgrading via the 'C:Users<user>AppDataLocalContinuumanaconda3envs
asapython.exe -m pip install --upgrade pip' command.
(rasa) C:Users<user>>pip --version
pip 20.2 from c:users<user>appdatalocalcontinuumanaconda3envs
asalibsite-packagespip (python 3.7)
Edit: Answer for the update:
Hey it seems that you do not have Visual C++ Build tools installed.
Here is a guide on how to install C++ Build Tools on Windows.
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