Downton Abbey: The Grand Finale arrived on Netflix in March, and its renewed audience activity this spring suggests the platform’s subscribers are finding it now, months after the theatrical run closed. That is an appropriate fate for a franchise that always played the long game. The film earned 91 percent on Rotten Tomatoes — the highest critical score across the three Downton features — against a $50 million budget and $103 million at the worldwide box office.