Unfortunately this stick doesn't work with the system we use. We use "Continuous scanning mode" meaning you can use more than 8 devices per stick and also this system has less data dropouts.
Before starting MaximumTrainer, try to close any ANT+ software (garmin express, ANT+ agent, etc.)
On startup, it should find your Stick and show it at the bottom right.
Let me know if this resolve your issue.
You can also contact me at firstname.lastname@example.org