From the Steam Store page:
Shadowrun: Dragonfall - Director’s Cut is a standalone release of Harebrained Schemes' critically-acclaimed Dragonfall campaign, which first premiered as a major expansion for Shadowrun Returns. The Director's Cut adds a host of new content and enhancements to the original game: 5 all-new missions, alternate endings, new music, a redesigned interface, team customization options, a revamped combat system, and more - making it the definitive version of this one-of-a-kind cyberpunk RPG experience.