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pip install failing due to repeatedly changing sha256 (ERROR: THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS FILE)

I am currently trying to install many different libraries into my Python environment. I've currently tried using a virtual environment and conda environment still resulting in similar errors.
As I'm doing this on a VM, I have to go through my corporate proxy, hence my pip install command looks a little verbose like the following:
pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org h5py --proxy http://user:password#proxy.internet.mycompany.local:8080
This had been working fine to download many different packages (including ones that are currently failing now), I'm not too sure what has changed, but now the command results in the following error:
Collecting h5py
Downloading h5py-3.1.0-cp37-cp37m-win_amd64.whl
\ 4.8 kB ...
ERROR: THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS FILE. If you have updated the >package versions
, please update the hashes. Otherwise, examine the package contents carefully; someone may have tampered >with them
.
h5py from https://files.pythonhosted.org/packages/53/c2/77bd81922264520b492bd7bfd1a51a845bc1187445408a7a83db284fd566/h5py-3.1.0-cp37-cp37m-win_amd64.whl#sha256=02c391fdb980762a1cc03a4bcaecd03dc463994a9a63a02264830114a96e111f
:
Expected sha256 02c391fdb980762a1cc03a4bcaecd03dc463994a9a63a02264830114a96e111f
Got 3fbaf847f810d5f6970abb0c7754abcca7dea17d315036fe5e4b26f427adf3a6
Although this error will still stay largely the same, the "Got" sha256 will change on each attempt, i.e. the following for the last returned line:
Got ff8197d74c233317597b89612691bf420806046093628ac02f0a92df3ac8123a
Got 8be06806b22d49aaa9b94113d8b3e075539303da96386971600c21cb8b9f8460
To rectify this error I've attempted the following:
using '--no-cache-dir' as suggested other Stack Overflow answers to similar questions
reinstalling python/pip or trying other versions of Python.
trying to use miniconda/anaconda instead
contacting owner of libraries about the issue (although I'm fairly sure it isn't library specific as I can't download any packages)
attempted to access the link in the error output: https://files.pythonhosted.org/packages/53/c2/77bd81922264520b492bd7bfd1a51a845bc1187445408a7a83db28%204fd566/h5py-3.1.0-cp37-cp37m-win_amd64.whl#sha256=02c391fdb980762a1cc03a4bcaecd03dc463994a9a63a02264830114a96e111f. This results in the following page response - the console section of developer tools states the following error: Failed to load resource: the server responded with a status of 404 (Not Found)
I've found a few similar issues to this already on Stack Overflow, but I've found nothing that resolves this.

Cannot install SSL on Python 3.7.1?

I'll start off with saying I read this post already and could not find an answer.
I am on Windows 10, and have been trying to install pipenv through powershell.
Only, it returns me the following error:
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
So I then downloaded ssl-1.16 from this website, but then ran into another error:
ValueError: This extension should not be used with Python 2.6 or later (already built in), and has not been tested with Python 2.3.4 or earlier.
I checked a few forums and still cannot seem to find an answer. So if anyone would know how to come to terms with that, I'd be truly grateful. :)
Thanks

Python 3.4.4 - pip collection error

I would really appreciate some help on the below query - I've been trying to get pip to work for the best of a day and really struggling.
Regardless of which module I try to install I keep getting a "Could not find a version that satisfies the requirement openpyxl (from version s: )
No matching distribution found for openpyxl
Please see a screenshot below of the error:
enter image description here
I've looked at around the website, including the following posts, to help with installing pip but still unsure as to why it isn't working.
'pip' is not recognized as an internal or external command
Fatal error in launcher: Unable to create process using ""C:\Program Files (x86)\Python33\python.exe" "C:\Program Files (x86)\Python33\pip.exe""
Any help would be massively appreciated!

Have you tried to check the internet connection?
From your screenshot, seems like you cannot access the URL as follow:.
https://pypi.python.org/simple/openpyxl/

pypi cannot install behind proxy

Whether I use PIP or download manually and run 'python setup.py install' on Pyramid I'm getting the same error: accessing standard pypi websites.
If I visit the sites in my browser it all works, but if I run the command it doesn't. Error as below.
I guess the fault will occur on most packages using these url's because I'm behind a proxy and my proxy is disallowing web access via python executable?
How do I specify pip or simply the apps setup.py to use my proxy, assuming this is the problem.
Installed c:\pymon\python34\lib\site-packages\pyramid-1.5.1-py3.4.egg
Processing dependencies for pyramid==1.5.1
Searching for PasteDeploy>=1.5.0
Reading https://pypi.python.org/simple/PasteDeploy/
Download error on https://pypi.python.org/simple/PasteDeploy/: timed out -- Some
packages may not be found!
Couldn't find index page for 'PasteDeploy' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading https://pypi.python.org/simple/
Download error on https://pypi.python.org/simple/: timed out -- Some packages may not be found!
No local packages or download links found for PasteDeploy>=1.5.0
error: Could not find suitable distribution for Requirement.parse('PasteDeploy>=
1.5.0')

My apologies I should have searched further:
Plone: pypi specific download issue behind a proxy server - can't install eggs
I created two environment variables: HTTP_PROXY and HTTPS_PROXY
Note the above comment regarding the --proxy argument also worked via pip.

How to install py.test on Windows

I am following the instructions on - http://pytest.org/latest/getting-started.html#installation-issues.
I have tried many options and also searched on the web. But I still get the following errors.
Installed c:\python26\lib\site-packages\pytest-2.2.3-py2.6.egg
Processing dependencies for pytest==2.2.3
Searching for py>=1.4.7.dev2
Reading http://pypi.python.org/simple/py/
Download error: [Errno 11001] getaddrinfo failed -- Some packages may not be found!
Couldn't find index page for 'py' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading http://pypi.python.org/simple/
Download error: [Errno 11001] getaddrinfo failed -- Some packages may not be found!
No local packages or download links found for py>=1.4.7.dev2
Best match: None
I have Windows XP and python 2.6. I want to install py.test on this settings. Is there a way for this to work?

from you instruction:
Windows: If “easy_install” or “py.test” are not found you need to add the Python script path to your PATH, see here: Python for Windows. You may alternatively use an ActivePython install which does this for you automatically.
How to set PATH variable