Older Agilent Multiport Test Set Software for E835xA PNA Analyzers

[Forzaman]

Hi, I have a Agilent E5357A VNA, and can pickup a Agilent N4416A test set which expands the measurement capability to four ports. The test set requires the N4425A Balanced Measurement Software however loaded on a PC, which doesn't come with the unit and Keysight does not provide anymore. Apparently this software works with other N441xA series test sets and their older ATN-4111x counterparts as well.
Does anyone have experience using any of these test sets with the N4425A software? If so, can you tell me if the software requires a license?

Thanks!