Upgrade from Standard Edition (free) to Enterprise Edition (paid) involves two steps:
Go to LiteSpeed Store
to order license. Go to this page
to find out what license you need if you are not sure what to choose.
Login to your server as root (via ssh or console)
Download and install package
Run below commands to download and install
tar zxf lsws-4.1.13-ent-x86_64-linux.tar.gz
echo "xxx-xxx-xxx" > serial.no # where xxx-xxx-xxx is the license key string
# Choose 'U' for upgrade when prompted and default for the rest.