Why can't I install 'manimlib'?

Window 10, manim version:(Tony031218 Merge pull request #1268 from niedong/ci-fix)

I installed Python 3.9.0 and Pycairo-1.20.0-cp39-cp39-win_amd64.whl.

This is how the current file is installed.
1. C:\ffmpeg
2. C:\sox-14-4-2
3. D:\manim
4. D:\Program Files\MiKTeX
5. C:\Users\Admini\AppData\Local\Programs\Python\Python39

When I installed requirements.txt in cmd, 'The wheel package is not available' appeared and the rest of the files were installed. It pops up like this when you try to install it again.
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D:\manim>python -m pip install -r requirements.txt
Requirement already satisfied: argparse in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 1)) (1.4.0)
Requirement already satisfied: colour in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 2)) (0.1.5)
Requirement already satisfied: numpy in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 3)) (1.19.4)
Requirement already satisfied: Pillow in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 4)) (8.0.1)
Requirement already satisfied: progressbar in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 5)) (2.5)
Requirement already satisfied: scipy in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 6)) (1.5.4)
Requirement already satisfied: tqdm in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 7)) (4.53.0)
Requirement already satisfied: opencv-python in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 8)) (4.4.0.46)
Requirement already satisfied: pycairo in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 9)) (1.20.0)
Requirement already satisfied: pydub in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 10)) (0.24.1)
Requirement already satisfied: pygments in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 11)) (2.7.2)
Requirement already satisfied: pyreadline in c:\users\admini\appdata\roaming\python\python39\site-packages (from -r requirements.txt (line 12)) (2.1)
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I also updated my 'pip' because I kept getting warnings.
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C:\Users\Admini>pip3 install --upgrade pip
Collecting pip
Using cached pip-20.2.4-py2.py3-none-any.whl (1.5 MB)
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
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But there was an error when I tried to install 'manimlib'.
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D:\manim>python -m pip install manimlib
Collecting manimlib
Using cached manimlib-0.1.11.tar.gz (4.8 MB)
ERROR: Command errored out with exit status 1:
command: 'C:\Users\Admini\AppData\Local\Programs\Python\Python39\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\Admini\\AppData\\Local\\Temp\\pip-install-0zvo25zb\\manimlib\\setup.py'"'"'; __file__='"'"'C:\\Users\\Admini\\AppData\\Local\\Temp\\pip-install-0zvo25zb\\manimlib\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base 'C:\Users\Admini\AppData\Local\Temp\pip-pip-egg-info-a0b1uyus'
cwd: C:\Users\Admini\AppData\Local\Temp\pip-install-0zvo25zb\manimlib\
Complete output (23 lines):
WARNING: The wheel package is not available.
ERROR:root:Error parsing
Traceback (most recent call last):
File "c:\users\admini\appdata\local\temp\pip-install-0zvo25zb\manimlib\.eggs\pbr-5.5.1-py3.9.egg\pbr\core.py", line 96, in pbr
attrs = util.cfg_to_args(path, dist.script_args)
File "c:\users\admini\appdata\local\temp\pip-install-0zvo25zb\manimlib\.eggs\pbr-5.5.1-py3.9.egg\pbr\util.py", line 271, in cfg_to_args
pbr.hooks.setup_hook(config)
File "c:\users\admini\appdata\local\temp\pip-install-0zvo25zb\manimlib\.eggs\pbr-5.5.1-py3.9.egg\pbr\hooks\__init__.py", line 25, in setup_hook
metadata_config.run()
File "c:\users\admini\appdata\local\temp\pip-install-0zvo25zb\manimlib\.eggs\pbr-5.5.1-py3.9.egg\pbr\hooks\base.py", line 27, in run
self.hook()
File "c:\users\admini\appdata\local\temp\pip-install-0zvo25zb\manimlib\.eggs\pbr-5.5.1-py3.9.egg\pbr\hooks\metadata.py", line 25, in hook
self.config['version'] = packaging.get_version(
File "c:\users\admini\appdata\local\temp\pip-install-0zvo25zb\manimlib\.eggs\pbr-5.5.1-py3.9.egg\pbr\packaging.py", line 862, in get_version
version = _get_version_from_pkg_metadata(package_name)
File "c:\users\admini\appdata\local\temp\pip-install-0zvo25zb\manimlib\.eggs\pbr-5.5.1-py3.9.egg\pbr\packaging.py", line 830, in _get_version_from_pkg_metadata
pkg_metadata = email.message_from_file(pkg_metadata_file)
File "C:\Users\Admini\AppData\Local\Programs\Python\Python39\lib\email\__init__.py", line 54, in message_from_file
return Parser(*args, **kws).parse(fp)
File "C:\Users\Admini\AppData\Local\Programs\Python\Python39\lib\email\parser.py", line 53, in parse
data = fp.read(8192)
UnicodeDecodeError: 'cp949' codec can't decode byte 0xe2 in position 2512: illegal multibyte sequence
error in setup command: Error parsing C:\Users\Admini\AppData\Local\Temp\pip-install-0zvo25zb\manimlib\setup.cfg: UnicodeDecodeError: 'cp949' codec can't decode byte 0xe2 in position 2512: illegal multibyte sequence
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output
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What should I do?