I updated VirtualHere to 4.0.6 from 4.0.5.
It created a default config.ini, which in addition to losing the license info lost any other configuration changes there.
I don't remember all of the changes I might have made over time because it's never happened before. Maybe you could make a backup of the current config file, certificate etc before the install/upgrade?
Sat Nov 23 18:20:33 2019 LOG_INFO >>> Starting VirtualHere USB Server v4.0.6 (Built: Nov 15 2019, 07:03:55)<<<
Sat Nov 23 18:20:33 2019 LOG_INFO Creating default configuration /volume1/@appstore/VirtualHere/config.ini
versus the 4.0.5 entry of
Sat Nov 9 17:28:28 2019 LOG_INFO >>> Starting VirtualHere USB Server v4.0.5 (Built: Oct 18 2019, 17:41:59)<<<
Sat Nov 9 17:28:28 2019 LOG_INFO Using configuration /volume1/@appstore/VirtualHere/config.ini
Sat Nov 9 17:28:28 CST 2019 Started successfully
I've re-applied the license and will make whatever changes needed, but I thought I'd let you know.