[Python] Runtimeerror (python 3.5 or later is required) when I try to install any library

I am trying to install some libraries to use on my python 3.4, but every time that I run pip install ("name of library") , it returns the following error:

Collecting pyautogui
Using cached https://files.pythonhosted.org/packages/35/71/a7d328fe19667777fb0c371ca346c89d1b380f7778fa1ba65aca1090478c/PyAutoGUI-0.9.49.tar.gz
Exception:
Traceback (most recent call last):
File "C:\Python34\lib\site-packages\pip\basecommand.py", line 232, in main
status = self.run(options, args)
File "C:\Python34\lib\site-packages\pip\commands\install.py", line 339, in run
requirement_set.prepare_files(finder)
File "C:\Python34\lib\site-packages\pip\req\req_set.py", line 385, in prepare_files
req_to_install.run_egg_info()
File "C:\Python34\lib\site-packages\pip\req\req_install.py", line 310, in run_egg_info
self.setup_py, self.name,
File "C:\Python34\lib\site-packages\pip\req\req_install.py", line 281, in setup_py
import setuptools # noqa
File "C:\Python34\lib\site-packages\setuptools\__init__.py", line 17, in <module>
import setuptools.version
File "C:\Python34\lib\site-packages\setuptools\version.py", line 1, in <module>
import pkg_resources
File "C:\Python34\lib\site-packages\pkg_resources\__init__.py", line 93, in <module>
raise RuntimeError("Python 3.5 or later is required")
RuntimeError: Python 3.5 or later is required

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