Open PowerShell and execute the code below:
Invoke-WebRequest -Uri "https://www.python.org/ftp/python/3.9.6/python-3.9.6-embed-amd64.zip" -OutFile "python.zip"
Expand-Archive -Path python.zip -DestinationPath python
Remove-Item python.zip
cd python
(Get-Content .\python39._pth) | %{ $_ -replace "#import site","import site" } | Set-Content .\python39._pth
Invoke-WebRequest -Uri "https://bootstrap.pypa.io/get-pip.py" -OutFile "get-pip.py"
.\python.exe get-pip.py
Remove-Item get-pip.py