.zip file you provided is not exactly a file, which you can get from a download page after login.
WordPress plugin installation .zip file should not contain any other directories except plugin parent directory – user-role-editor-pro in our case. Your file contains _MACOSX folder. May be it’s a reason of security warning?
Did you try to upload to a site the exactly that .zip file, which you got from a role-editor.com download page?
