Could not find a version that satisfies the requirement tkinter python 3.7.2 windows 10
When installing packages with pip, it automatically collects any dependencies of these packages, if they aren't already installed. For example, if you install SciPyand you haven't installed NumPy, pip will automatically install NumPy, because it is listed in SciPy's dependencies.
The error you got happens, when one of the listed requirements of the package you want to install is not availible. This can have a number of causes:
The required package is not availible on PyPi.
The required package or the package you want to install is not compatible with your version of python.
You typed the wrong package name.
When i try pip install tkinter, i get the same error. The reason for that is that tkinter is already included in the python standard library (at least for python 3.x). You shouldn't have to install it. You can verify that tkinter is working by a simple example like
import tkinter as tkroot = tk.Tk()root.mainloop()