Actually my current php version is 5.5, so… And I’m now using the 2.7.95 instead of the 2.8 versions, everything is fine. So could you check the problems for me? The issue is: When I upgrade to newest version, every file I used to upload is not downloadable by any roles: subscriber, author or admin. I wonder why this happen. And I wonder if any other people are facing the same problem as mine.