I've made a video on how I activate the trainer. It hasn't recorded the trainer sound, so make sure you've enabled the YT notes:
www.youtube.com/watch?v=BVWioY1Ocsw
its really weird. I do the same thing and I got the error. no tthat I dont hear 2nd activate but just error
there is still no new version so wait, be patient
The readme was updated, and I can see no plausible way for the error message to change had the executable not been updated as well. The Reus trainer has also took position as most recent on the new trainers list.
I can't draw any other conclusion.