How to purge Zero Tier completely from Windows 10

How to purge Zero Tier completely from Windows 10?
Zero Tier works perfectly when I first install it and use it on my Windows 10 laptops - for the first few times. After several uses the orange icon disappears from my taskbar and when I download the latest msi installer, it starts vanishing from the task bar and becomes unusable. Uninstalling and re-installing does not solve this. I have tried all ways to uninstall it.

I need to purge Zero Tier completely from Windows 10 (from the registry too) and start over. I know this will work because Zero Tier works fine on a new install on Widows 10.

using zerotier-cli join worked (running command prompt as administrator)