It seems the whole island was raised to be above sea level, not only the lake areas.
That's actually quite a major tweak. As all the objects will have to be setposed to ground level after the raise.
I'll look into it. No promises, though.
Anyway, all this sounds more like a modification than a fix, and for that I guess the author should be contacted, which I didn't for the fixed version as nothing was actually changed from the original (just slightly tweaked and corrected). Which leads to, is Instructor still active around this parts?