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This is correct. It was deprecated on August 6, 2016 in 7.4.beta0, and recently removed on September 16, 2018 in 8.4.beta6. All versions in between gave a message saying:

N is deprecated. Please use n instead.

See http://trac.sagemath.org/13055 for details.

So you can replace .N( by .n( in your old worksheets.