Recently we installed Nable on a Mac however when trying to remote control it , the screen would stay black with a Please Wait…. Message

The knowledge online said to whitelist it from here as it was OSX 10.14 Mojave , however there was nothing displaying here : 

We Installed the Take Control Viewer manually v6.00.00 directly from the installer link. https://swi-rc.cdn-sw.net/n-central/mac_viewer/6.00.00/MSPA_N-central_Installer_Viewer_6.00.00.zip