Could not find a version that satisfies the requirement couchbase-3.0.0a4

The docs list `pip install --pre couchbase-3.0.0a4` as the latest release here, however, you will get a "pip" error: Could not find a version that satisfies the requirement couchbase-3.0.0a4. The correct cmdline for installing alpha 5 is `pip install --pre couchbase==3.0.0a4` on Windows.