The elicenser soft only needs to be installed once, and then reads the dongles that byou plug into your system.
The "applications open " problem happens whenever you have an application open that uses a dongle which is communicating with the eLicenser.
Just quit Nuendo, Wavelab, Cuabse, VSL or whatever and you will be able to “work” within elicenser.
eLicenser does not hold licenses. It downloads/moves/maintains the licenses on the dongles that are plugged in.
So if you remove a dongle, or a license from a dongle, eLicenser will show nothing. So if a license is missing, then it is missing from the dongle.
In the “help” menu, there is a function “download latest Installer”.
HTH
Fredo