Debian Upgrade EdgeRouter

Hi Guys,

I have been using ZeroTier on our EdgeRouter for quite some time using the method described by Dennis Kruyt (https://blog.kruyt.org/zerotier-on-a-ubiquiti-edgerouter/ ) this works great but it doesnt survive an upgrade. Does anyone have a solution to this?
Is there a different way to install zerotier on an edgerouter?