This is a problem that had annoyed me a lot because conda environment file had specific versions specified and we were not allowed to change them to maintain compatibility of python code across different users and geographic.
Problem
conda install numpy=1.11.3 mkl=11.3.3 matplotlib=1.5.3 psutil=5.4.7 numexpr=2.6.1 h5py=2.6.0 hdf5=1.8.15.1 pandas=0.23.3 pytables=3.2.2 python=3.5.2 python-dateutil=2.5.3 setuptools=27.2.0 vc=14.1 vs2015_runtime zlib=1.2.11 bzip2=1.0.6 scipy=0.18.1
(py35) C:\Users\Sukhbinder>conda install numpy=1.11.3 mkl=11.3.3 matplotlib=1.5.3 psutil=5.4.7 numexpr=2.6.1 h5py=2.6.0 hdf5=1.8.15.1 pandas=0.23.3 pytables=3.2.2 python=3.5.2 python-dateutil=2.5.3 setuptools=27.2.0 vc=14.1 vs2015_runtime=15.5.2 zlib=1.2.11 bzip2=1.0.6
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
PackagesNotFoundError: The following packages are not available from current channels:
- vs2015_runtime=15.5.2
Current channels:
- https://conda.anaconda.org/conda-forge/win-64
- https://conda.anaconda.org/conda-forge/noarch
SOLUTION
The solution is surprisingly simple.
conda config --set restore_free_channel true
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