I see you're looking for a specific resource related to the Yamaha PSR-S900 keyboard.
Yamaha has never released an official Kontakt library for the PSR series. Their focus is on selling hardware (Montage, Genos) and proprietary software (Yamaha Expansion Manager). Any "library" claiming to be an official S900 for Kontakt is likely a user-created hack. yamaha psr s900 kontakt library free download extra quality
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If you are looking for official software support from Yamaha for the hardware unit itself, you can find official updates and manuals on their support pages: Firmware Updates I see you're looking for a specific resource
Before downloading any free resources, make sure to: Any "library" claiming to be an official S900
If a site promises a full PSR-S900 Kontakt library for free, it’s either fake, a virus, or stolen content.