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"gotten" definitely sounds odd to me (I'm from England) but it's worth noting that we do keep that form in "forgotten".

Presumably both were acceptable over here at some stage. "I see no reason why gunpowder and treason should ever be forgot."

The word “forgot” was chosen to rhyme with “plot”, so may not have been a normal use of the word/form.

(Now you've made me want to watch V for Vendetta again!)

Its worth noting that use of "forgot" instead of "forgotten" is also found in the first line of Auld Lang Syne, where it isn't rhymed with anything.