Yamaha offers several free software tools for creating and managing accompaniment styles for their arranger keyboards and workstations. Official Yamaha Style Software (Free)
These often contain the original Yamaha Style Fixer (a real tool) but wrapped in adware installers. Stick to the sources below: yamaha style creator software free download
If you are looking for styles to download rather than software to create them: Yamaha offers several free software tools for creating
Because Style Creator software requires "source" material (MIDI files or existing styles), you can find free content from these reputable community sources: MIDI Song to Style V1.2.0 for Windows 11 - Yamaha Music Unlock Your Creativity : With Style Creator, you
: While primarily for managing expansion packs, YEM is essential for organizing custom styles and voices into "Personal Packs" to load into your instrument via USB. : Available on the Yamaha Support Audio Phraser
The holy grail for many players is the official Yamaha Style Creator software. But here is the truth: Yamaha no longer officially distributes their legacy PC style editors (like CASM Editor or the original Style Creator for older models). However, that doesn't mean you are stuck. There is a robust ecosystem of free software that does the job better than the original tools ever did.