The setup of the ISL client needs to be executed on the same node as the license webservice is installed. The installation and operation of the ISL client is described in a separate section which is delivered in the help sub-folder together with the ISL client setup.
The current version does not support choosing a custom port during the ISL Client installation. Thus, please keep the Use Default Port option in the Client Service Port Selection step. If you change the port anyway, you might see "ORA-06502 PL/SQL: numeric or value error: character string buffer too small" during login. On the History tab in the ISL Client, it will show an error entry that "The application version is not compatible with the port modification in ISL Client".