We had a Mac returned to us running 10.12.6 and E80.64. We decrypted and uninstalled Endpoint, upgraded MacOS to 10.15.2, then installed E80.89.
Everything seems to be working except the padlock icon is not appearing in the top menu. I can search for "Endpoint Security" and manually run it, then it does appear, but after a reboot it doesn't automatically load.
I've built a few machines with both this version of Endpoint and OS before and not seen this, although I think this might be the first which had a previous version before.
Perhaps something got left behind of the old version? What would be the simplest way to ensure the icon gets loaded corretly for all users, without having to add the application as a startup item for each and every user, which would be tedious.
The other thing I just noticed is that on a Mac that shipped with 10.15.1 installed, the icon does load and its menu has a "Connect" option.
On the upgraded Mac, I can run Endpoint, with no "Connect" option, and cannot configure VPN from within the client either, but I can also manually run "Endpoint Security VPN", which then gives me two icons on the top menu!