Included the min file inside the folder, and registered the plugin, but caught the error:
ScrollSmoother Uncaught TypeError: Cannot read properties of undefined (reading '_getVelocityProp')
gsap.registerPlugin(ScrollTrigger, ScrollSmoother)
let smoother = ScrollSmoother.create({
wrapper:"#smooth-wrapper",
content: "#smooth-content",
smooth: 2, // seconds it takes to "catch up" to native scroll position
smoothTouch: 0.1,
effects: true // look for data-speed and data-lag attributes on elements and animate accordingly
})