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The best (English language) source, in my opinion, is Hyam Maccoby's Judaism on Trial: Jewish-Christian Disputations in the Middle Ages (Littman Library of Jewish Civilization; 1982). In it you will find a translation of the Ramban's Vikuach, and of the official church account of that disputation, together with an extensive introduction and commentary. The ...
You can find the sefer online here, from HebrewBooks.org.
First, a correction to the question. The Ramban does not say that Megillah is not a problem because it was instituted by nevi'im, rather he says that it is not a problem because a source was found within the Torah. See Ramban's hasagot to Sefer Hamitzvot, Shoresh 2: וכבר אמרו(מגלה יד.) ״ארבעים ושמונה נביאים ושבע נביאות עמדו להם לישראל לא פיחתו ולא הותירו ...
Rabbi Nathaniel Helfgot explains that the Ramban is only bothered by Purim because it was an institution of the Nevi'im - prophets. What does Rashi mean? A simple understanding of his words would seem to indicate that he doesn't believe that Chanuka presents a problem, since its source is not a takanat nevi'im. Only a mitzva which is introduced as ...
It's in the Kisvei HaRamban. Volume 1, I think.
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