I'm using Windows 10. Before this problem, After Effects didn't start up at all. I've also tried reinstalling Creative Cloud and After Effects but it didn't work.
When I look at the task manager while clicking open in the creative cloud software, it appears but quickly disappears after. Or sometimes it'll appear and sometimes it won't at all.
It usually appears under Adobe CEF Helper. Photoshop works just fine when I open it, but I just bought AE.
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i found the solution
This is a very strange case,
CC version draw files from CS6, and without it CC version does not start
so need to install the After Effects CS6
(any related version of After Effects CS6 should be work)
and - After Effects CC 2017/2018 - will be start again.