I have issued since I used update Mac Sierra some my old file AE CS 6 can't open old file CS 6, I think Adobe need to update patch for file in Adobe after effect CC 2015, or someone can give me tips or solution for opening file AE CS6 in Adobe AF CC 2015 run Sierra macos?
Start a CC2015 project and see if you can File>Import File your old CS6 project.
Yes still can open the file but not showing any object on the frame
Two things come to mind:
First and foremost, Adobe has not yet approved Sierra for ANY of its software! It's tough enough to get AE to run properly on an approved OS!
CS6 is getting a little long in the tooth. You can't assume that it will run flawlessly on an OS that's 5 years newer.
But here's your consolation -- you can discover all the ways Sierra breaks AE CS6! Thank you for your selfless volunteer work!