I have bought the one-time licence version of Pinegrow after having looked at the demo (no problems running that). I am running on Linux (Debian). Now, with the full activated version, I am getting an error message:
The internal webserver is not accessible at undefined. Error received:
TypeError: Failed to execute 'fetch' on 'Window': Failed to parse URL from http://:40000/pginternal/detect
I have done various searches for solutions and also tried to open a port in the firewall, as suggested, but no joy. On the Pinegrow website it says to try pointing my browser to http://127.0.0.1:40000/ and “You should get a short 404 - Not found message if the web server is accessible. If that’s the case contact us about the issue.”, which is the case.
I will contact support, but also asking on the forums for any possible help.