So, I downloaded the second GM before the public release, tried to open it and got this error: The application “Install macOS Sierra” can’t be opened. I then downloaded the public release from the Mac AppStore, same problem.
I tried using
chmod +x /..../Contents/MacOS/Install/InstallAssistant, made the app open but immediately stops responding.
Note: I did download both files from another Mac, put them on USB and brought them home, I always used this method and it worked, not working now. I'm on a late 2013 MacBook Pro (15 inch).
Any suggestions or ideas on why this error is occurring?