The GetClass()>0 && GetClass()<16 is just a class check, to make sure it is a valid player class. So yes that is the sentense. The class()-1 means the new database shifted the player class by 1 compare to old database. Not easy to catch though when I thought it was a spell id mismatch.
Hey, now I become someone who answer questions! A couple of hours ago I was still the one looking for answers!
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