How to change your version of your Mac OS?
- Open Terminal and enter
sudo nano /System/Library/CoreServices/SystemVersion.plist
and enter your admin password.
- Change the two strings "10.11" to "10.12". Leave the minor version number (e.g. 0, 1, 2...) like it is. Hit ctrlO and Enter to write the file to disk.
- Hit ctrlX to quit nano