I think, to say "gotten" instead of "got" (in terms of: I have got/gotten) or "forgotten" instead of "forgot" is correct, at least in British English - that's what I learned at school. "gotten/forgotten" is a little bit older and might not be very common, but, please correct me if I am wrong, I think both forms are still valid. The same applies to different spelling of words in Britain and the US (neighbor vs. neighbour; theater vs. theatre).
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