Downgrade Windows Ultimate to Premium 64bit

Hey I just built my new computer and somehow downloaded windows ultimate instead of premium during my code verification. Now I am stuck on Ultimate with only a premium code. Is there a way to downgrade back to premium so I can use my code. And for some reason reinstalling windows will not work, it gives me some error that my files are corrupt but the files are on a disk that i recieved yesterday.
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More about downgrade windows ultimate premium 64bit
  1. Clean install.
  2. what do u mean by that?
  3. Check pm!
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