Well it doesn't work for me. First of all, thanks to unhelpful readme file, I'm not sure where to install it (it wants to point towards my own personal campaign files in my documents folder, which is where I ended up putting it). Second of all, despite saying that the SCN/RND/LND.mis files have been updated, they have not (judging by the "modified" date on this files and the fact that the weather was still the same when I ran the campaign to test it).
Can someone who has gotten SH3 Weather to work with GWX 2.0 come in here please and tell us how you did it?