Eclipse Plugin Update Issue

Ok. I have read this thread and others and am finding it impossible to install/update the ConnectIQ Eclipse plugin.

I have tried to update on my previously working Mars installation, but that failed.

I then installed Neon.

I tried to install the plugin, per the instructions from this link per the ConnectIQ Readme:
http://developer.garmin.com/downloads/connect-iq/eclipse/

I then found another post on this forum that Garmin changed the download link to https, so I tried this link:
https://developer.garmin.com/downloads/connect-iq/eclipse/

Here is the error I get when attempting an installation on Neon:
Unable to read repository at https://developer.garmin.com/downloads/connect-iq/eclipse/content.xml.
Unable to read repository at https://developer.garmin.com/downloads/connect-iq/eclipse/content.xml.
Unrecognized SSL message, plaintext connection?

What am I doing wrong?