Matt Damon and Casey Affleck will star in “The Instigators,” a new film for Apple Studios, the company announced Thursday. “The Instigators” sees Damon and Affleck play thieves who have to go on the run with one of their therapists following a failed robbery. Doug Liman, who directed Damon in the “Bourne Identity” film series, is attached to helm the film, based on a script by Chuck MacLean, best known for creating the Showtime series “City on a Hill.” Affleck developed the current project with Jeff Robinov and John Graham. In addition to starring, Damon will produce the film with Ben Affleck for Artists Equity.