Thanks for your response!
Yes I was thinking security issues too, so I had tried some switching as users. I just spent another hour with seeming random results.
I normally run as a standard user but I also tried it as administrator. It seems to be very random, sometimes working as a std user and sometimes working as admin.
Logged in as std user is most troublesome:
The plugin installs (I have to give admin password to install it) and I get an icon on the taskbar, but the web editor never sees it. When I log off the icon disappears and I have to reinstall it to get the icon back, but have the same problem over again.
I discovered that even though I'm installing as a std user, it gives this path when installing:
C:\Users[admin]\AppData\Roaming\ArduinoCreateAgent-1.1
(Must pick that up from when it makes me use the admin password to install when logged in as std user)
That seems wrong to me, so I changed the path to:
C:\Users[std user]\AppData\Roaming\ArduinoCreateAgent-1.1
When doing that, it's in the path you suggested earlier
C:\Users\yourname\AppData\Roaming\ArduinoCreateAgent
But there is no file or folder you suggested:
C:\Users\yourname\AppData.arduino-create
Windows defender firewall is giving it permission on local networks.
Logged in as admin:
It all worked fine when first installed and upon one restart, but on a second restart, it failed.
Even when it worked there was no folder in the path:
C:\Users\yourname\AppData.arduino-create
I licensed Windows 10 online after getting the computer. It licensed fine.
Sorry - I don't know what you mean by listing the security on the computer.
Man, do I have a headache!
P.S. all other apps installed work fine.