If you are a Mac user then you can easily download the iso installer (dmg file) from the official site of apple. It has improved the reliability of the Microsoft Exchange message sync.You can now unlock a FileVault-encrypted APFS volume using a recovery keychain file.Bluetooth appeared as unavailable has been fixed.This new upgraded version has improved the reliability of SMB printing.You can download the MacOS high sierra from the direct download link for your Mac computer, VirtualBox or Vmware. MacOS High Sierra is the fourteenth release of macOS which comes with a lot of upgraded features. If you are currently using MacOS older version then I have good news that you can upgrade your old OS with MacOS high sierra for free. It is the second most widely used OS as per Wikipedia. MacOS is one of the most popular operating systems which is developed and market by App Inc.