Whenever i try to go back to older version of otree using  pip install -U "otree<5", I am getting the following errors,
Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      This version of oTree is not compatible with Python 3.9.
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.

How do i resolve this?