macOS Sierra Installer not launching: The application “Install macOS Sierra” can’t be opened 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?
I know it sounds stupid, but I compressed the file and transferred it to my personal Mac via USB, decompressed and it worked, but seriously couldn't find out what was causing that error.