My machine has python 2.7 and windows 7 x64. I am trying to download a python 3.5 and Linux compatible version of a package. It works when I pass in the version option, it works when I pass in the platform, but fails when passed in together. This works for me: pip download --only-binary=:all: --python-version 35 numpy This also works: pip download --only-binary=:all: --platform manylinux1_x86_64 numpy This does not work: pip download --only-binary=:all: --python-version 35 --platform manylinux1_x86_64 numpy Could not find a version that satisfies the requirement numpy==1.12.1 (from versions: ) No matching distribution found for numpy==1.12.1 Continue reading...