How to Install Pyfoam Pip/Python with Different Versions

I installed pyfoam as:

pip install PyFoam

According to . Now, I try to use pyFoamVersion.py and I got this message:

Traceback (most recent call last): File "/usr/local/bin/pyFoamClearCase.py", line 4, in <module> __import__('pkg_resources').run_script('PyFoam==2021.6', 'pyFoamClearCase.py') File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3251, in <module> @_call_aside File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3235, in _call_aside f(*args, **kwargs) File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3264, in _initialize_master_working_set working_set = WorkingSet._build_master() File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 583, in _build_master ws.require(__requires__) File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 900, in require needed = self.resolve(parse_requirements(requirements)) File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 786, in resolve raise DistributionNotFound(req, requirers) pkg_resources.DistributionNotFound: The 'PyFoam==2021.6' distribution was not found and is required by the application

I tried this:

pip --version pip 20.0.2 from /usr/lib/python3/dist-packages/pip (python 3.8) and

python --version Python 2.7.18

How to solve this mess?