I just installed Window 10 insider beta update 14367. After the Windows 10 Beta installation does not run and I get an error message..."Norton Security has encountered an error: 8504, 104". I waited a while and nothing seemed to happen so I cancelled the "Autofix".
I have a feeling that all I need do is reinstall. There is a brand new Norton beta update available but I can't install that right now. I have to install the previous beta 22.7.0.69. Then I can install 22.7.0.75 by updating through Norton Update.