Hi Charlie.
You need two ANT+ dongles, one to transmit and one to receive. A single computer will be enough, but with two would be more comfortable, one for Zwift and one for the ANT software.
Connect the dongle(s) and fire up Simulant. Bind just ONE dongle to Simulant. Of course, the second must be free to bind to Zwift.
This is, if you’re using just ONE computer, you MUST RELEASE one of the ANT devices from SimulANT+ to allow Zwift to see that second one.
Now go to Add Simulator and select Bike Trainer (FE-C). This is not the only chance, but for the sake of simplicity, select this.
Go to Device Simulation Configuration and set cadence and instantaneous power. And click on Actions:TurnOn.
Zwift should now be able to pair. Enjoy.
Disclaimer.
I know (@Gerrie, I’m aware, OK ??) that this may be used to cheat. There are obviously a ton of ways to cheat within Zwift, and this is not the easier or cheapest, IMHO. I’ve been a top gun as a runner in my day. To be brutal, an actual athlete will never mix up real-life results with a game like Zwift. Add, if Zwift would care of, there are obviously strategies to mitigate the cheating, but this is up to Zwift, not me.
Cu. Paolo