When I go to install packages, following the instructions at https://www.jetbrains.com/pycharm/help/installing-uninstalling-and-upgrading-packages.html, The green plus is always greyed out. Sometimes clicking on one of the already-installed packages will make it light up green, but even when it does and I click on it, all I get for packages is is the Phrase "Nothing to Show" in the left pane. The repositories button reveals a single line: https://pypi.python.org/pypi. There's no change whether I make a virtualenv or not.
PyCharm 5.0.4Tried with Pythons 2.7.10, 3.4.3, and 3.5
This forum looks pretty dead, but I've looked everywhere else I can think of