Right, I should have worded that better.
I redownloaded the 0.18.2 patch and the file seems to be the same *as 0.19*. I may have been playing on the original 0.18 update (which, in my old zip, has a smaller size).
Updating that file from the full download fixed the issue, though it would have been enough to use the much smaller 0.18.2 patch.