If you share what kind of Montage sounds you need (pads? leads? acoustic emulations?), I can point you to specific free Kontakt instruments that get very close.
To understand why a "free download" of a Montage library is problematic, one must understand the source material: yamaha montage kontakt library free download high quality
If you want the specific sound of the Montage without paying for sample packs, the best resource is . If you share what kind of Montage sounds you need (pads
However, there are several high-quality third-party Kontakt libraries designed to emulate the Montage's sound, as well as official free sound libraries for actual Montage hardware owners. Top Yamaha Montage-Style Kontakt Libraries the best resource is . However
: Visit the Expanding MONTAGE M page on YamahaSynth to download official free expansions.