The first time
After making sure Beatformer is installed correctly,
open a new instance of Ableton Live and click Live on the top toolbar menu
Click on Preferences...
Click the File Folder tab
Use Audio Units should be On if you want to use the Audio Unit version of Beatformer
Use VST Plug-In System folders should be On if you used the defaults during installation
Now click Rescan and close the Preferences window
In the Browser Sidebar
Click on Plug-ins
You should be able to see the main VST folder and the Audio Unit folder (if you enabled it)
Beatformer Audio Unit
You will find Beatformer inside the accusonus folder
You will find Beatformer inside the VST folder
Tip : If you have many plug-ins installed, take a moment to look carefully in your plug-in list before panicking !
You can drag & drop Beatformer in MIDI, Audio, Send, Return and Bus tracks.
Place it anywhere in your chain of effects, but expect different creative results depending on the position.
Note: Even though you can apply Beatformer in the Master channel, or even apply it twice, it is not the recommended use. We won't stop you though :)