Here is detailed information on how to add your Toontrack product as a plug-in in Ableton.
This guide was made using the mac Ableton Live Suite version 11.3.21.
The easiest way to insert a plug-in in Ableton is to find it in the plug-in list (Plug-Ins) to the left in the Ableton browser. Then click and drag it to an existing track or to an empty spot next to a track.