See numpy/numpy#17885 (comment) -- in 20.2.4 this works:
$ python3.9 -m pip install --progress-bar off --upgrade "pip!=20.3"
...
Successfully installed pip-20.2.4
$ python3.9 -m pip install --progress-bar off --upgrade --pre --only-binary ":all:" -i "https://pypi.anaconda.org/scipy-wheels-nightly/simple" numpy
...
Collecting numpy
Downloading https://pypi.anaconda.org/scipy-wheels-nightly/simple/numpy/1.21.0.dev0%2Bd0a457f/numpy-1.21.0.dev0%2B20201129035606_d0a457f-cp38-cp38-manylinux2010_x86_64.whl (15.4 MB)
Installing collected packages: numpy
Attempting uninstall: numpy
Found existing installation: numpy 1.21.0.dev0+d3cffdc
Uninstalling numpy-1.21.0.dev0+d3cffdc:
Successfully uninstalled numpy-1.21.0.dev0+d3cffdc
Successfully installed numpy-1.21.0.dev0+d0a457f
But with 20.4:
$ python3.9 -m pip install --progress-bar off --upgrade --pre --only-binary ":all:" -i "https://pypi.anaconda.org/scipy-wheels-nightly/simple" numpy
...
Collecting numpy
Downloading https://pypi.anaconda.org/scipy-wheels-nightly/simple/numpy/1.21.0.dev0%2Bd0a457f/numpy-1.21.0.dev0%2B20201129040310_d0a457f-cp39-cp39-manylinux2010_x86_64.whl (15.4 MB)
ERROR: Requested numpy from https://pypi.anaconda.org/scipy-wheels-nightly/simple/numpy/1.21.0.dev0%2Bd0a457f/numpy-1.21.0.dev0%2B20201129040310_d0a457f-cp39-cp39-manylinux2010_x86_64.whl has different version in metadata: '1.21.0.dev0+d0a457f'
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