The PyPI deploy job of the 1.1.0 release has partially failed:
https://travis-ci.org/streamlink/streamlink/jobs/513828143#L3637
https://pypi.org/project/streamlink/#files

This means that there are no win32 and win-amd64 wheels on PyPI for the 1.1.0 release which include the streamlinkw executable (#2326).

The problem is the cygwin wheel, which was not accepted by PyPI. Fortunately, the any wheel (all platforms) was uploaded first, so the damage of the release failure is minimal. We should fix this in a 1.1.1 release soon, though.

The cygwin wheel can be removed from the next build, but now I'm not sure whether the other ones will be rejected on the next release as well, because there doesn't seem to be a list of platform names accepted by PyPI.

#2326 (comment)

https://www.python.org/dev/peps/pep-0425/#platform-tag
https://www.python.org/dev/peps/pep-0425/#id1
https://www.python.org/dev/peps/pep-0427/#file-name-convention

The Windows specific wheels can be built and installed locally like this:

git clone https://github.com/streamlink/streamlink.git
cd streamlink
pip install -U setuptools wheel
pip install -U -r dev-requirements.txt
pip install pycountry
python setup.py bdist_wheel --plat-name=win32
pip install -U ./dist/streamlink-1.1.0-py2.py3-none-win32.whl