STERLING — Complete with “Boos,” “Hisses” and “Hoorays,” it’s time for a good, old-fashioned melodrama as Sterling High School Theatre presents its winter play “Sundown Alley.” With a cast of 20, the show by playwright Tim Kelly and directed by Piper Harding will be presented at 7:30 p.m. on Thursday, Jan. 30 and Saturday, Feb. 1 in the school’s theater.