Although Adventures of Don Juan (1948) is mentioned as Flynn's forthcoming project, the film was not released until 1948.
Oddly, although this is a Warner Brothers Vitaphone release, Errol Flynn was the only one of the stars working for Warner at the time. For example, Jane Withers was at Republic and Virginia Weidler had already made her final film at MGM.
Vitaphone Production Reel #1418A.