I'm wondering if its possible to save photos from :ightroom without having the source files (they all have question marks on them and my external hard drive crashed so I don't have the original files).. I've already tried downloading some 'extractpreview.lua' thing and it didn't work.. I'm using a Mac
So sorry to hear about your hard drive crash! In the future, besides a good backup scheme, I recomend making smart previews of at least your top rated images. This will give you a 2450px image that can be exported from LR without the need for the original or a plugin.