Python 3.9 alpha how to install psutil?

[lmh1]

Something misssing?

dnf install -y python3-devel.x86_64
Last metadata expiration check: 0:02:55 ago on to. 09. april 2020 kl. 23.01 +0300.
Package python3-devel-3.8.2-2.fc32.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
[root@PC3# pyenv global 3.9-dev
bash: pyenv: command not found...
[root@PC3]# pip -V
pip 20.0.2 from /usr/local/lib/python3.8/site-packages/pip (python 3.8)
pyenv install 3.9-dev
bash: pyenv: command not found...

Did you also have idea here?
I have issue with this om some windows 10 computer did not know why?