Zerotier UI never loads

How do I recover the use of the Zerotier UI? I’ve installed and uninstalled Zerotier several times on a Windows 11 machine. The first time it installed correctly with the UI available in the system tray. Every other time I’ve installed it, the UI Exe is installed to the program files(x86) Zerotier folder but it never appears in the system tray. If I then try to run it manually nothing happens. I’ve uninstalled and reinstalled several times. By the way, an uninstall does not remove the Zerotier registry entries, so one time I tried doing that manually. It made no difference.