vaex: [BUG-REPORT] pip install is broken

there are many other closed issues about this but it still pops up for me. If I do pip install vaex-core vaex-hdf5 and then try to import vaex it it cant find ANY of the submodules. I have also tried the more general pip install vaex with same results.

I have tried everything, reinstalling multiple times, cleared pip cache etc. It just never works somehow. It used to work for me but I am on a new virtual machine and now I cant install anymore.

I am running python3.9 on latest centos. installed packages:

Package         Version
--------------- -----------
aplus           0.11.0
blake3          0.1.8
certifi         2021.5.30
chardet         4.0.0
cloudpickle     1.6.0
dask            2021.6.2
frozendict      2.0.3
fsspec          2021.6.1
future          0.18.2
h5py            3.3.0
idna            2.10
locket          0.2.1
nest-asyncio    1.5.1
numpy           1.21.0
pandas          1.2.5
partd           1.2.0
pip             21.1.2
progressbar2    3.53.1
pyarrow         4.0.1
python-dateutil 2.8.1
python-utils    2.5.6
pytz            2021.1
PyYAML          5.4.1
requests        2.25.1
setuptools      57.0.0
six             1.16.0
tabulate        0.8.9
toolz           0.11.1
urllib3         1.26.6
vaex-core       4.3.0.post1
vaex-hdf5       0.8.0
wheel           0.36.2

when I try to open a hdf5 file I get:

ModuleNotFoundError: No module named 'vaex.hdf5'

very frustrating to not get it to work 😦 anybody any ideas?