Wait, you said "New INSTEON Device does not expect any device buttons to be pressed", but then you also said "Note that battery RF devices such as the Motion Sensor, TriggerLinc, RemoteLinc2 must be put into linking mode manually by pressing the device Set button for 3-5 seconds before using New INSTEON Device."
Anyways for some reason this problem has stopped. Now I've got a light dimmer, triggerlinc, and motion sensor successfully connected. I added the triggerlinc and motion sensor by holding the set button on each and then doing New INSTEON device. The problem is, I have another triggerlinc I'm trying to add, but it won't work. When I add it the progress bar gets to 7% and then closes and nothing happens.
Also, my light dimmer keeps randomly turning off on its own.