You have to drop the database, but generally if you're looking to save character and account data , all you need to do is dump those 2 tables, create the new ones, then put those back in. 
 
Theres an upgrade script in the release, but theres a couple of minor bugs in it (they can be worked through pretty easily though) 
		
	
		
		
		
		
		
		
			
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