I am a first time poster, please have compassion. 😉
I just installed UAVcast-Pro on my Pi Zero. I am using Raspberry Pi OS and installed everything via the Terminal, download and installation worked fine and it gave me the IP address which I entered in the Browser of my Smartphone to reach the Webinterface. At this point, I have no flight controller connected yet, just keyboard and screen. The Pi Zero has a stable WIFI connection. I tried it many times, a few times the webinterface popped up but disappeared again after about half a minute. It seems to work but very unstable. I was able to enter the licence key one time, but then it kicked me out again. What could be the Problem?