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Problem downloading (pytube) library in Python

I want to download a library from Python libraries called (pytube)
When I place the download command [pip install git + https: //github.com/pytube/pytube] in the cmd panel, the following output will come out:
Collecting git+https://github.com/pytube/pytube
Cloning https://github.com/pytube/pytube to c:\users\jit\appdata\local\temp\pip-req-build-w3q3fwqn
Requirement already satisfied (use --upgrade to upgrade): pytube==10.6.1 from git+https://github.com/pytube/pytube in c:\users\jit\appdata\local\programs\python\python39\lib\site-packages
Using legacy 'setup.py install' for pytube, since package 'wheel' is not installed.
WARNING: You are using pip version 20.2.3; however, version 21.0.1 is available.
You should consider upgrading via the 'c:\users\jit\appdata\local\programs\python\python39\python.exe -m pip install --upgrade pip' command.
So I write what prompts [pip install --upgrade pip] into the cmd panel, and it gets the following output:
Installing collected packages: pip
Attempting uninstall: pip
Found existing installation: pip 20.2.3
Uninstalling pip-20.2.3:
Successfully uninstalled pip-20.2.3
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'C:\\Users\\jit\\AppData\\Local\\Temp\\pip-uninstall-pnqylmmj\\pip.exe'
Consider using the `--user` option or check the permissions.
Illustrative image :
https://suar.me/ve9J0
And in another attempt to install it, I typed the command in the (Terminal) inside the (PyCharm) program:
Collecting git+https://github.com/pytube/pytube
Cloning https://github.com/pytube/pytube to c:\users\jit\appdata\local\temp\pip-req-build-o5uke_cl
Running command git clone -q https://github.com/pytube/pytube 'C:\Users\jit\AppData\Local\Temp\pip-req-build-o5uke_cl'
Illustrative image :
https://suar.me/OZYPG
And I did not succeed in installing the library! Why is that? How do I get to the solution?

Try installing pytube3. pip install pytube3
for the pip warning it's just a warning because you are not using the latest version , use this command to upgrade it: python -m pip install --upgrade pip

Welcome to Stackoverflow!!!
For pytube as you already installed, try upgrade to latest version pytube-10.6.1:
python -m pip install --upgrade pytube
For pip install --upgrade pip error, this is happening due to insufficient access:
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'C:\\Users\\jit\\AppData\\Local\\Temp\\pip-uninstall-pnqylmmj\\pip.exe'
Solution:
Consider using the `--user` option or check the permissions.
Try:
python -m pip install --upgrade pip --user
Or open the command prompt as administrator and execute the same command.

I get the following error while upgrading pip in python

ERROR: Could not install packages due to an EnvironmentError:
[WinError 5] Access is denied:
'c:\python39\lib\site-packages\pip-20.2.3.dist-info\entry_points.txt'
Consider using the --user option or check the permissions.
WARNING: You are using pip version 20.2.3; however, version 20.3.3 is
available. You should consider upgrading via the
'c:\python39\python.exe -m pip install --upgrade pip' command.

A duplicate of this. But here goes:
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\python39\lib\site-packages\pip-20.2.3.dist-info\entry_points.txt' Consider using the --user option or check the permissions.
A permission error, you can run your command prompt as an administrator or add the --user flag on your pip command.
WARNING: You are using pip version 20.2.3; however, version 20.3.3 is available. You should consider upgrading via the 'c:\python39\python.exe -m pip install --upgrade pip' command.
Just a warning telling you that you have an outdated pip version.

How to update pip to latest version 20.0.2

While using this command
"python -m pip install --upgrade pip"
I get this error message:
"Collecting pip
Using cached https://files.pythonhosted.org/packages/54/0c/d01aa759fdc501a58f431eb594a17495f15b88da142ce14b5845662c13f3/pip-20.0.2-py2.py3-none-any.whl
Installing collected packages: pip
Found existing installation: pip 19.2.3
Uninstalling pip-19.2.3:
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\\program files (x86)\\python38-32\\lib\\site-packages\\pip-19.2.3.dist-info\\entry_points.txt'
Consider using the `--user` option or check the permissions.
WARNING: You are using pip version 19.2.3, however version 20.0.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command."
What's the solution to this?

I'm not too sure what the error could be, but I suspect the problem is that you are not running your terminal/command prompt as an administrator. So when you are launching your terminal/command prompt just right-click and run as administrator
Or you could try using a different method of updating pip,
pip install --upgrade pip

Can you try with this command instead ? Also if any issue persists try running cmd as Administrator
python -m pip install --user --upgrade pip

pip3 installed without pip

I have pip3 installed from when I installed Python3 through Homebrew. But now when I use pip3 to install things, I get the following message:
You are using pip version 10.0.1, however version 19.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
But when I use pip install --upgrade pip, I get the following message:
-bash: pip: command not found
I'm not sure what the precise terminology is, but should I be "linking" the pip command to pip3?

Upgrade pip3 as follows to avoid the confusion between pip and pip3:
python3 -m pip install --upgrade pip

cmd pip displaying errors whenever I try to install pygame

I am on a windows 10 system, and I recently installed the latest version of python python 3.7.0. I enable the PATH and tried to install pygame through CMD.
I first type in pip, that works as normal.
I then try pip install pygame
Now, this is where the problem arises.
CMD comes up with this:
Collecting pygame
Using cached https://files.pythonhosted.org/packages/b0/30/4df62b0eb0f09a8ad1c329ff5479b3b115e8dce25475fd0c2f73cb790aa4/pygame-1.9.4-cp37-cp37m-win32.whl
Installing collected packages: pygame
Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\\program files (x86)\\python37-32\\Lib\\site-packages\\pygame'
Consider using the `--user` option or check the permissions.
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
So I type in python -m pip install --upgrade and then this happens:
Collecting pip
Using cached https://files.pythonhosted.org/packages/5f/25/e52d3f31441505a5f3af41213346e5b6c221c9e086a166f3703d2ddaf940/pip-18.0-py2.py3-none-any.whl
Installing collected packages: pip
Found existing installation: pip 10.0.1
Uninstalling pip-10.0.1:
Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\\program files (x86)\\python37-32\\lib\\site-packages\\pip-10.0.1.dist-info\\entry_points.txt'
Consider using the `--user` option or check the permissions.
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
Why is it doing this?
Somebody please help me and thank you in advance.

"Access dienied" means that you don't have enough permissions to change the global setup of your Python installation.
Either open a cmd line with Adminstrator permissions, or better: learn how to use Python virtual environments: https://docs.python-guide.org/dev/virtualenvs/