I don't see any reason why you shouldn't use 3.0. Its newer, has better performance / quality, less artifact. I am using 3.0 i can see slightly less distortion around the edges and i think slightly less lag. Just go with 3.0 no reason to go with the outdated version.
I can't seem to download 3.0. On its Steam page I get "You own this", but what's on my system is 2.31
It’s just an update as any other. Once LS is up-to-date open the program and in the top right corner where it likely says 2.3 select the drop-down & 3.0 should be an option. It’s not the program itself that is version 3.0, it’s the version of FSG available in lossless scaling you’re looking for.
