[SOLVED] Installing protonvpn from SBo

I'm trying to install the protonvpn-cli package from SBo. All dependency packages are installed.

Any use of the protonvpn command results in the following failure:

Code:Traceback (most recent call last):
File "/usr/bin/protonvpn", line 6, in <module>
from pkg_resources import load_entry_point
File "/usr/lib64/python3.7/site-packages/pkg_resources/__init__.py", line 3126, in <module>
@_call_aside
File "/usr/lib64/python3.7/site-packages/pkg_resources/__init__.py", line 3110, in _call_aside
f(*args, **kwargs)
File "/usr/lib64/python3.7/site-packages/pkg_resources/__init__.py", line 3139, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib64/python3.7/site-packages/pkg_resources/__init__.py", line 581, in _build_master
ws.require(__requires__)
File "/usr/lib64/python3.7/site-packages/pkg_resources/__init__.py", line 898, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib64/python3.7/site-packages/pkg_resources/__init__.py", line 784, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'certifi>=2017.4.17' distribution was not found and is required by requestsI'm presuming the failure is related to the python-certifi package, but I'm not a Python person and don't know how to fix.

Any help is appreciated.

Thanks. :)

Edit: Slackware 14.2, fully updated.