How to update FNX/FNE license servers' software?

See also - Failover license server installation, upgrades and updates.
It is the advantage of the FNE/FNX server, that an update works without downtime. Do the following steps:
Note: If there is not a failover or tertiary server existing, you can skip the steps accordingly.
Test the integrity of the downloaded SW on the primary license server:
sh install-fne-<date>-<version>.sh test
If you get the message "Package integrity verified" you can proceed with the other steps.
Get emergency license for standby emergency license server and install it - just to be prepared
Primary server: Do a dry-run installation on the primary server and look for messages. Example for the dry-run command:
sudo sh install-fne-<date>-<version>.sh dry-run
Primary server: If there are not any problems reported with the dry-run, do the update on the primary server. Example for the update command (no option used):
sudo sh install-fne-<date>-<version>.sh
Check e.g. with 
fne-status, that the primary server is running.
Wait 2 minutes.
Failover server: Do the update also on the failover server. See command above.
Check e.g. with 
fne-status, that the failover server is running.
Wait 2 minutes.
Check with 
fne-status, if the FNE failover and (if installed) FNP triad is up again.
Tertiary server: Do the update also on the tertiary server.
Check e.g. with 
fne-status, that all servers are running. 
If there are any problems, please check, if a switch to the standby emergency license server is reasonable and open a LIST ticket to report the problem.