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ERROR: Could not find a version that satisfies the requirement tensorflow-directml

I tried to install:
pip install tensorflow-directml
from directml on my Windows 10. I have an intel GUP and I was hoping I could use it. But I got the error:
ERROR: Could not find a version that satisfies the requirement tensorflow-directml (from versions: none)
ERROR: No matching distribution found for tensorflow-directml
Did I miss something?
EDIT:
I'm using python 3.8

Seems that the library supports Python 3.5, 3.6 and 3.7. Python3.8 is not supported at the moment (1). Is your pip installation connected to any of those versions? Try using pip --version to confirm to which Python version it is connected. In case that it shows a Python 2 version, try using pip3 install tensorflow-directml.

can't install pptk in python

I'm trying to install the pptk module in PyCharm for visualising 3D point clouds.
Initially I tried installing in PyCharm via File > Settings > Python Interpreter > Install > pptk
However, it couldn't be found and advised I use pip instead.
So on my command prompt I navigated to the folder containing Python 3.9 and tried pip install pptk
And I got the following error ERROR: Could not find a version that satisfies the requirement pptk (from versions: none) ERROR: No matching distribution found for pptk
I'm not sure what I'm doing wrong or why no version can be found? Am I missing something obvious in the installation?

According to the requirements by the pptk module, the minimum Python version required is 3.6. Judging by the fact that there's no distribution found for 3.9 I believe that it was missing a PyPi repo for it, therefore downgrading to Python 3.6 should fix the problem. Judging by your response to my comment, that did work.

What does "from versions" mean in pip error message?

On https://pypi.org/project/tensorflow-text/2.1.1/, I copied command pip install tensorflow-text==2.1.1 and run it.
However, pip gives error
> pip install tensorflow-text==2.1.1
ERROR: Could not find a version that satisfies the requirement tensorflow-text==2.1.1 (from versions: 2.4.0rc0)
ERROR: No matching distribution found for tensorflow-text==2.1.1
Does "from versions: 2.4.0rc0" mean pip is only aware of 2.4.0rc0?
Since https://pypi.org/project/tensorflow-text/#history lists so many versions, why is my pip only aware of one particular version?
I'm using Python 3.7.9 on Windows.

How do I resolve the error "No matching distribution found for pywin32"?

I am trying to install pywin32 and also tried installing pypiwin32 but everytime it throws an error message stating :
Collecting pywin32
ERROR: Could not find a version that satisfies the requirement pywin32 (from versions: none)
ERROR: No matching distribution found for pywin32
I am trying to install this package on pycharm using Tool > External Tools > Pydl UI > Install.
I even tried Installing it via python interpreter.

Check interpreter (File/Settings/Project:xxx/Project Interpreter), and make sure that's the one you are adding libraries to. Or just create an empty project and select the interpreter you are updating, and it should work out.

Could not find a version that satisfies the requirement UnityEngine

Am working on Python 2.7.14 and I want to use UnityEngine, to run my script from Unity, when I try to install it with pip : pip install UnityEngine, this error come up:
`Could not find a version that satisfies the requirement UnityEngine (from versions: )
No matching distribution found for UnityEngine`
How can I fix this? Can anyone help me with this please?
PS: Am working on windows

There is no UnityEngine at PyPI (i.e. the package does not exist so cannot be pip installed).
May be you need http://forum.unity3d.com/threads/86461-Python-interpreter-in-Unity or https://github.com/exodrifter/unity-python but they're not pip-installable.