Have you downloaded macOS Sierra numerous times only to be told that the macOS Sierra application is damaged? It’s not, and I have had this happen to me when installing in a virtual environment. Stick around for a few minutes and I will show you how to bypass the “This copy of the Install macOS Sierra application is damaged, and can’t be used to install macOS.” message given during installation.
00:00 – Installer error message.
00:34 – Implementing a workaround for the error message.
01:05 – Resuming the installation of macOS Sierra.