macOS Sierra 10.12.6 Combo Update (recommended to upgrade from any previous version of Sierra). Download macOS Sierra 10.12.6 Update - Apple Support
Here’s why:
: Sierra was the first version to drop support for several Macs from 2007–2009. For many "Late 2009" and "Mid 2010" Macs, 10.12.6 represents one of the final viable, lightweight operating systems before the requirements for newer versions became too demanding. Virtualization Mac Os Sierra 10.12.6 Dmg File Download
: Improved compatibility for Enterprise SMB connections and Xsan client stability. macOS Sierra 10
If the initial download is base Sierra (10.12), you can update to the final version using these direct standalone update links from Apple: macOS Sierra 10.12.6 Update (for users already on 10.12.5). Mac Os Sierra 10.12.6 Dmg File Download
