When moving to another server please do the following:
Copy the serial.no file content as you will need them for the new server.
run the command:
This command will talk to the Litespeed license server and unlock your serial number, it will generate a 3 day temp license so you don't get any downtime.
nano serial.no, then paste in the content from the old one. Save it.
If you wish to copy your old installation directory over to the new hardware, then you just need to activate your license.
./lshttpd -r to retrieve a new license key.