Apologies for the late reply. I was watching. I was just busy with long day at work then having a beer with Sally. Of-course, we discussed the future of Flowx.
As a avid Linux user myself, I can understand what you’re trying to do and why. I can send you a link to an APK but sorry I cannot fix the pro version thing - this does require Flowx checking Google Play Services to check your subscription. There might be a way around this but it would be a hack. I will think about how to do this. I also have to be careful since Google/Apple can be picky with their policies for their platform.
Cheers, Duane.