The instructions on that page are not complete. You can run the command `. licenseInstaller help` (from the /bin/Tools folder) to see the full syntax. Basically you have to include the license Id and version, server and port (if not the default of 5814). The command should look like this:

./licenseInstaller concurrent 10594 1 10.0.2.50:5814
where 10.0.2.50:5814 is the server IP and port and 10594 is the license ID for a full UFT license. Your license ID may be different depending on the license type you have (for example, runtime engine only). You can check what your license server has available by running the following command:

./licenseInstaller licenses 10.0.2.50:5814