I am on the latest version of python and I have tried all the commands to install pyjama, but the error I get is: 

Defaulting to user installation because normal site-packages is not writeable
  Requirement already satisfied: pygame in /Library/Python/2.7/site-packages (1.9.6)

I don't know where to find this information or how to downgrade to a older version of python.
Can anyone help??
could you provide the commands you used for installation which results in that error? 
Seems like you've already installed it on Python2 and are trying to install it there again. If you're using pip, maybe you could try using pip3 instead. Alternatively you can also use the following command:

python3 -m pip install XXX
Can't install pygame on python 3.8.3