How to install kivy on python (python game)

check this link to install kivy on python 3.8.

check this link to get command

[Proladon]

Can't install it ...
every command will show up :
No module named pip.__main__; 'pip' is a package and cannot be directly executed

[dikshek]

Could not find a version that satisfies the requirement kivy.deps.sdl2 (from versions: )
No matching distribution found for kivy.deps.sdl2

[zookeroni]

everything was fine till main.py did not opened ( I use 3.7.4. version )