So, can one eat meat on Friday in the Octave of Easter?
The 1983 Code of Canon Law says in can. 1251:
Abstinence from meat, or from some other food as determined by the Episcopal Conference, is to be observed on all Fridays, unless a solemnity should fall on a Friday… (Can. 1251)
The General/Universal Norms for the Liturgical Year and the Calendar 24 says that:
The first eight days of the Easter season make up the octave of Easter and are celebrated as solemnities of the Lord.
It seems that on Friday in the Octave of Easter we are exempt from the obligation to abstain.
This is not, by the way, the case with Friday in the Octave of Christmas.
That said, Fridays are penitential days. I don’t think you sin if you maintain something of a penitential spirit, even when Friday is in the Octave of Easter. Maybe a Santa Cristina could grace your dinner table rather than your usual 1990 Brunello di Montalcino and you might have three courses instead of your usual four.