Version 3.0.3.0 would have been a minor patch release, likely fixing MPEG-2 stream compatibility or menu rendering bugs. Philips discontinued SuperAuthor around 2008, shifting focus to Blu-ray and then exiting consumer software entirely.
Are you asking about this for or producing SACD discs ? If you are trying to play high-res audio , I can suggest more modern alternatives to SACD-R, such as using an Oppo player with USB support or streaming to a DAC0;5af; . 0;2c; Philips SuperAuthor 3.0.3.0.zipbfdcm- - Google
If you are looking to manage Philips dictation files or authoring software, it is highly recommended to use official channels: Version 3