I think you don’t necessary have to download the js file, but simply add the script to Font Awesome CDN into the <head> of your site (or of your page if you don’t use Font awesome in every pages).
You know, I’d love to get this figured out once and for all.
I also have FA 5 PRO license. So, I successfully have got FA to work within webflow using another tutorial.
That of, uploading the FA webfont files, and then placing the icon as a glyph, and choosing FA style from the FONT panel… This isn’t ideal as I have to get the glyphs instead of just my normal fa-user, fa-alarm-clock etc… which for those that use it, you have it in memory.
I have also linked the FA CDN, but there is nothing that I can do to make it work.