Hello LilRedDog,
After reading your reply post, I logged into the forum and saw the perhaps automated notice quoted below. I don't understand what any of that means either, except a general kind of 'don't go there.' So I guess that's probably better for everyone, and I'm sorry.
It said, " There are known intermittent issues generating custom images using the online image generator (firmware selector and sysupgrade servers). This affects Attended Sysupgrade (ASU), OWUT (OpenWrt Upgrade Tool), and the firmware-selector custom image tool. See this thread for more details.
Please do not open new threads on this topic as it has already been discussed in numerous threads (with the same answers each time)."