did you ever manage to solve this?
I am also having this fail:
(synthesis) miranda9@Brandos-MBP ~ % conda install pytorch torchvision torchaudio -c pytorch
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: - 
Found conflicts! Looking for incompatible packages.                                                                                                                                                                                                                                                                   failed                                                                                                                                                                                                                                                                                                                    

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Output in format: Requested package -> Available versions

Package pytorch conflicts for:
torchaudio -> pytorch[version='1.2.0|1.3.0|1.3.1|1.4.0|1.5.0|1.5.1|1.6.0|1.7.0|1.7.1|1.8.0|1.8.1|1.9.0']
torchvision -> pytorch[version='1.2.0|1.3.0|1.3.1|1.4.0|1.5.0|1.5.1|1.6.0|1.7.0|1.7.1|1.8.0|1.8.1|1.9.0|>=1.1.0|>=1.0.0|>=0.4|>=0.3|>=0.2|1.7.1.*|1.3.1.*']
pytorch

Package six conflicts for:
torchvision -> six
pytorch -> mkl-service[version='>=2,<3.0a0'] -> six

@smth Perhaps you’d know?
I just started a brand new env with python 3.9 and only numpy installed. Why can’t I install pytorch 1.9 the current newest version?

cross posted:

https://www.reddit.com/r/pytorch/comments/o1hwgv/installing_pytorch_fails_on_macos_with_brand_new/
SO: python - Unable to install Pytorch on Mac OS X from scratch due to Pytorch package conflicts with Conda - how to fix? - Stack Overflow 1