Installation: No module named 'oemof.solph.buses'

[fptz]

Hello!

I am running into a problem trying to install oemof-visio.
I am installing all other packages from a yaml file to setup my env, the oemof versions therein being the following:
- oemof-network==0.4.0rc0
- oemof-solph==0.4.4
- oemof-tools==0.4.1
-
When trying to install oemof-visio just like that (- oemof-visio==0.0.1) i get the following error:
Pip subprocess error: ERROR: Could not find a version that satisfies the requirement oemof-visio==0.0.1 (from versions: none) ERROR: No matching distribution found for oemof-visio==0.0.1

Then, trying to follow the instructions of the ReadMe file, i tried installing it via git:
pip install git+https://github.com/oemof/oemof_visio.git

which yields the error:
from oemof.solph.buses._bus import Bus ModuleNotFoundError: No module named 'oemof.solph.buses' WARNING: Discarding git+https://github.com/oemof/oemof_visio.git. Command errored out with exit status 1: 'C:\Users\pontzenf\AppData\Local\anaconda3\envs\oemof_v4\python.exe' 'C:\Users\pontzenf\AppData\Local\anaconda3\envs\oemof_v4\lib\site-packages\pip\_vendor\pep517\in_process\_in_process.py' get_requires_for_build_wheel 'C:\Users\pontzenf\AppData\Local\Temp\tmpiktdgls2' Check the logs for full command output. ERROR: Command errored out with exit status 1: 'C:\Users\pontzenf\AppData\Local\anaconda3\envs\oemof_v4\python.exe' 'C:\Users\pontzenf\AppData\Local\anaconda3\envs\oemof_v4\lib\site-packages\pip\_vendor\pep517\in_process\_in_process.py' get_requires_for_build_wheel 'C:\Users\pontzenf\AppData\Local\Temp\tmpiktdgls2' Check the logs for full command output.

I also tried cloning the repository to my local machine and installing it locally, which yielded the same error.

Do you have any ideas about what might be the problem?
Thanks a lot in advance!
Greetings!