For $9.99/month, Komplete Now includes Session Horns Pro plus dozens of other instruments. This is effectively "portable" if you use the same Native ID across Macs—just log in and download.
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Fortunately, there are legitimate alternatives for those deterred by the high cost of the Pro version. Native Instruments frequently runs sales, offering deep discounts on their libraries. Additionally, they offer a "Session Horns" (non-Pro) version, which is more affordable and still provides high-quality sounds. For those strictly looking for free options, there are legitimate free brass libraries available for the full version of Kontakt, as well as free standalone plugins like DVS Saxophone or Spitfire Audio's "LABs" series, which, while not horns, offer high-quality orchestral sounds for free. session horns pro free download portable mac