Actually there is a simple way, contrary to the accepted answer. It is only about creating this file (on macOS): $HOME/Library/Preferences/IntelliJIdea<version>/idea.key This path will need to be adjusted for Windows and Linux.
The contents of this file are just one line pointing to your license server. For example, if your license server is running at http://jetbrains.example.com , then the idea.key file should contain: URL:http://jetbrains.example.com
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