Errors Installing xbox-smartglass-api through pip.

Having gotten the rest of the dependencies to set this up ready to go except for this, its time for me to move on to the api itself. When I insert the command "pip install xbox-smartglass-core" I receive the following output:

# pip install xbox-smartglass-core
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Collecting xbox-smartglass-core
  Using cached https://files.pythonhosted.org/packages/89/e6/1ff0909838fb63fd225bbf949e2ee1f0e2909e6cdda3f03d4e285f54ec91/xbox_smartglass_core-1.1.1-py2.py3-none-any.whl
Collecting marshmallow-objects
  Using cached https://files.pythonhosted.org/packages/c8/d3/6d045a7d0436ede60ce7328a1a261b0c517dc36c49a6785559f3e43bb7f8/marshmallow-objects-2.3.0.tar.gz
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
    Preparing wheel metadata ... done
Collecting xbox-webapi>=1.1.8
  Using cached https://files.pythonhosted.org/packages/3a/6b/3c96584f9b3dcab2ff94983ea4eb3ab57efeed32923439e4483512923aa6/xbox_webapi-2.0.10-py2.py3-none-any.whl
Collecting dpkt==1.9.1
  Using cached https://files.pythonhosted.org/packages/e1/0f/30a8462ed17092a5d61ea12e212e9ce3740f19f5f9f2431287410429d306/dpkt-1.9.1-py2-none-any.whl
Collecting aenum==2.1.2; python_version <= "3.5"
  Using cached https://files.pythonhosted.org/packages/44/c4/7cda7e7e71e18ad999cb9d23f9969f818af1ed6be71d18db7963680b8320/aenum-2.1.2-py2-none-any.whl
Collecting Flask
  Using cached https://files.pythonhosted.org/packages/f2/28/2a03252dfb9ebf377f40fba6a7841b47083260bf8bd8e737b0c6952df83f/Flask-1.1.2-py2.py3-none-any.whl
Collecting gevent==1.3.7
  Using cached https://files.pythonhosted.org/packages/40/4f/222cefc08c1ffda69454908496e46c32f7b82da30ade4861178c6a72405e/gevent-1.3.7-cp27-cp27mu-manylinux1_x86_64.whl
Collecting construct==2.9.41
  Using cached https://files.pythonhosted.org/packages/e6/f5/064be5013506d54212b396e8fc3e9890e60ed6a27df6d52529f0b8361cd5/construct-2.9.41.tar.gz
Collecting cryptography==2.3.1
  Using cached https://files.pythonhosted.org/packages/87/e6/915a482dbfef98bbdce6be1e31825f591fc67038d4ee09864c1d2c3db371/cryptography-2.3.1-cp27-cp27mu-manylinux1_x86_64.whl
ERROR: Could not find a version that satisfies the requirement marshmallow>=3.0.0 (from marshmallow-objects->xbox-smartglass-core) (from versions: 0.1.0, 0.2.0, 0.2.1, 0.3.0, 0.3.1, 0.4.0, 0.4.1, 0.5.0, 0.5.1, 0.5.2, 0.5.3, 0.5.4, 0.5.5, 0.6.0, 0.7.0, 1.0.0a0, 1.0.0, 1.0.1, 1.1.0, 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, 1.2.6, 2.0.0a1, 2.0.0b1, 2.0.0b2, 2.0.0b3, 2.0.0b4, 2.0.0b5, 2.0.0rc1, 2.0.0rc2, 2.0.0, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.2.0, 2.2.1, 2.3.0, 2.4.0, 2.4.1, 2.4.2, 2.5.0, 2.6.0, 2.6.1, 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.8.0, 2.9.0, 2.9.1, 2.10.0, 2.10.1, 2.10.2, 2.10.3, 2.10.4, 2.10.5, 2.11.0, 2.11.1, 2.12.0, 2.12.1, 2.12.2, 2.13.0, 2.13.1, 2.13.2, 2.13.3, 2.13.4, 2.13.5, 2.13.6, 2.14.0, 2.15.0, 2.15.1, 2.15.2, 2.15.3, 2.15.4, 2.15.5, 2.15.6, 2.16.0, 2.16.1, 2.16.2, 2.16.3, 2.17.0, 2.18.0, 2.18.1, 2.19.0, 2.19.1, 2.19.2, 2.19.3, 2.19.4, 2.19.5, 2.20.0, 2.20.1, 2.20.2, 2.20.3, 2.20.4, 2.20.5, 2.21.0, 3.0.0a1, 3.0.0b1, 3.0.0b2, 3.0.0b3, 3.0.0b4, 3.0.0b5, 3.0.0b6, 3.0.0b7, 3.0.0b8, 3.0.0b9, 3.0.0b10, 3.0.0b11, 3.0.0b12, 3.0.0b13, 3.0.0b14, 3.0.0b15, 3.0.0b16, 3.0.0b17, 3.0.0b18, 3.0.0b19, 3.0.0b20, 3.0.0rc1, 3.0.0rc2, 3.0.0rc3, 3.0.0rc4, 3.0.0rc5)
ERROR: No matching distribution found for marshmallow>=3.0.0 (from marshmallow-objects->xbox-smartglass-core)

I've been searching and have found some similar problems with this kind of thing elsewhere but nothing I found specifically could help me with this, why isn't pip installing it normally as its supposed to? I should probably mention I'm running on Centos7 with Python3.6.8 and 2.7 installed. Pip 20.something, most recent before 21 I believe.

OpenXbox / xbox-smartglass-nano-python

Errors Installing xbox-smartglass-api through pip. #25