Sorry if it doesn't work for you. Try to go in a Bitcoin meetup they may be able to help you directly. Also where I have been there were meetups for Openstreetmap you could try there too to ask.
I tried an updated version through @franzap's Zapstore. That one also says unavailable. I'll keep trying.
reply
Just to make sure again, did you try the web version of the app? (Which worked for me, I checked again before replying)
I downloaded it through Neo Store but I think the repository is shared with FDroid.
reply
No. I'll try it.
reply