Can't install Flowable BPMN designer on Eclipse

Flowable Designer
1

I can’t install Flowable BPMN 2.0 designer as plugin to Eclipse 4.6.3 by accessing http://www.flowable.org/designer/update/. In fact the url is not accessible at all from the browser using http or https links.
Who I need to contact to resolve this issue?

2

The screen shot of exact response is as follows:

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image.png1920×1080 302 KB

3

see Not Working eclipse plugin link - https://www.flowable.org/designer/update/