Not able to install "Open Dental CAD" add-on to Blender

Please I need help to install 'Open Dental CAD" add-on to Blender software, 2.78. I have made several attempts with no success. I am directed to this link, but nothing is working: https://github.com/patmo141/odc_public/
Any assistance on how to install this important add-on will be greatly be appreciated. I have sent email message, with no response. Therefore, I am bringing this to the attention of the Blender Community to get urgent assistance, as I have been on this for a while!

Sincerely,
Godfrey

Installs in blender 2.79 so I’d expect it to work in 2.78

Download the zip file from the link you gave above
File / User Preferences / Addons, use the ‘install addon from file’ option and select the zip file
Enable the addon tickbox

Sorry, but it doesn’t work…( error.