Solution:
To solve your issue you can navigate to the folder with script
cd "C:\Python\Tools\Scripts"
or you can add this to your path varibale.Then try to run the command:
python get-pip.py
or
pip install <package_name>
or if that doesn't work use;
python -m pip install <package_name>
or you can use this;
py -3 -m pip install <package_name>
If you installed pip in the time of your python installation this might be a problem. You should upgrade it by unning the command:
python -m pip install -U pip
Hope this helps you to solve your problem. If it is not working let me know.
Happy coding.