The Allegro/Presto/Vivace package can be run either through a trial account (configured by the <trial> block) or through a license file (configured by the <production> block, which includes the <license_path> element).
The default configuration file for the Server shows the configuration for the trial account, while the whole <production> block is omitted;
it must have been missing when you first installed Lightstreamer.
Then you, after receiving a DEMO or DEV or PROD license file, must have added the block, by copying it from GETTING_STARTED.TXT, where you found the needed instructions.

So, you should leave your <production> block unchanged and it will be managed.
However, as you are using a license file, if you haven't received it recently,
then it won't be accepted by Server 3.6
Hence, you should ask for upgraded license files, by supplying the details to info@lightstreamer.com