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PSS/E 35 onwards, licensing is changed. The 50 bus version has the same installation files as the full version. Access is controlled by software license (partially by hardware dongle too). For earlier versions, university version (50 bus) and full versions have separate installation files. You must be using full version, which can only be used with hardware license (that is why getting errors). You may try to get installation files for university version for non-commercial use.