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			"If I had known, I would have done it differently."   is perfectly correct, as far as I know.  "If I would have known"  sounds more awkward to me, as a USA English speaker.   We prefer the version you didn't like it!    UK people,  is this a difference in styles?  OP is from Germany, so he may have learned a more formal UK version of English?
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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