Traffic Light Not Installing On Safari

Trying to install traffic light on my daughters macbook air and it has installed on Firefox but won't install on Safari. Worked fine on our other Mac but not her device.

When I get to the safari extensions page for traffic light it doesn't have an install option, the the link on the page (http://trafficlight.bitdefender.com) just times out when I try to connect to it.

She is on OSX version 10.11.6 with Safari version 9.1.2

Screenshot below is of what I see when I go to the extensions on her Safari. On the home Mac it had a link to install the extension on this page, but for some reason it won't show here.

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