Can't Install Packages

Using PyCharm Pro 2018.1 on Mac. I've not had issues installing packages in the past, but now can't. 

Using the menu (PyCharm / Preferences / Project Interpreter / + ) to install the PIL library, I get the following error:

Collecting PIL
 Could not fetch URL https://pypi.python.org/simple/pil/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:598) - skipping

Could not find a version that satisfies the requirement PIL (from versions: )
No matching distribution found for PIL

Through the command line using pip3.4 (I'm using Python3.4 in my venv), I get the following:

Downloading/unpacking PIL

  Cannot fetch index base URL https://pypi.python.org/simple/

  Could not find any downloads that satisfy the requirement PIL

Cleaning up...

No distributions at all found for PIL

From various articles on the forums and StackOverflow I've also tried:

1. Creating a pip.conf file containing:

[global]
trusted-host = pypi.python.org

In both $home/Library/Application Support/pip $home/.config/pip

2. Adding https://pypi.python.org/pypi to the list of repositories in Manage Repositories (but it won't actually save the new repository)

3. Replacing the existing https://pypi.python.org/simple repository with https://pypi.python.org/pypi (also won't actually save the changes).

4. I tried to install a few other packages just to see if there was something wrong with PIL, all failed similarly.

Any suggestions? Help is greatly appreciated, I've grown fond of PyCharm and don't want to go back to a text editor :-)