a long time ago, my app used a Quartz composition, as a drag n drop, drop zone. Then Apple made significant changes to Cocoa, and broke Quartz Composition viewer in IB. So, I reverted to an older version of the drop zone, that was built from an NSImageView. Now I'm porting my code to Swift as an excercise, and lo-and-behold: NSImageView has a serious bug which makes using it as a drop zone impossible for me... But Quartz Compositons are back!
but the Quartz Composer app is nowhere. How can I find/download it?