Thanks longhorn, for the advice.
So I've finished downloading, and even though I forgot to use Cleanitool as recommended on the readme file [if there's one thing I learned working with IT support is that users are idiots, and I'm no exception to the rule], everything worked beautifully.
So here's a message for you guys on the same situation I was in: if your cities have plenty of NAM Version May 2010 stuff, you're good to go with this update. None of my cities crashed so far, and some of them had heaps of NAM stuff. But keep in mind that I don't use yet most of the fancy stuff [RHW, GLR, etc]., so there could be other causes for conflict.
Thanks again for this, guys. Gosh, I can't remember the last time I've placed a C&P Ferry Terminal! I haven't tried the new stuff yet, which seems to be great... But so far the fix for the Ferry terminal is the most exciting feat on this release! [i wonder if the cities that crashed before because of placement of Ferry terminals will no longer crash with this fix].