Do you need specific from the Trinity, like the "Muted Guitar" or "Pads"? Which DAW (e.g., FL Studio, Ableton, Logic) are you using?
Create a free KORG ID and download the KORG Software Pass. From there, you can install the Trinity demo.
A unique, slightly digital, yet warm character. The Search for "Korg Trinity VST Free"
If a paid VST is not an option, you can achieve a very similar, nostalgic 90s sound using free VST plugins:
IK Multimedia’s workstation contains a wide variety of sounds, including many classic synth and workstation samples from the 90s. How to Get the 90s Workstation Sound Free (Tips) To get the Korg Trinity sound without the plugin:
The world of free Korg Trinity sounds is richer and more accessible than ever. Whether you use the official demo to record that perfect part, download a community-made Kontakt library, or fire up a classic SoundFont, you can absolutely capture the magic of this legendary workstation without spending a dime.