conda compatibility issues

[carmichaelong]

@aymanhab

Using this channel: https://anaconda.org/opensim-org/opensim

On MacOS, works with python=3.9 but not another version (e.g., python=3.7).

• Works with an environment whose python version is 3.9

conda create -n opensim-py39 python=3.9
conda activate opensim-py39
conda install -c opensim-org opensim

• Does not work with an environment that isn't python=3.9

conda create -n opensim-py37 python=3.7
conda activate opensim-py37
conda install -c opensim-org opensim

This pulls the incorrect build for opensim: which fails on import opensim

[aymanhab]

@moorepants @chrisdembia @kidzik or @adamkewley any idea why conda would pull the wrong build for the python version? What version conda did you use @carmichaelong so we're all in sync? Thanks. There're builds for py37,39 on windows, mac, linux and the latter is consistent with google colab env

[carmichaelong]

conda 4.11.0 installed using the miniconda installer for python 3.9 (Miniconda3-py39_4.11.0-MacOSX-x86_64.sh)