Hello rollinglenn,
I see that your MacBook stopped opening .DMG files after you updated to macOS Sierra. I can imagine it's concerning to have something not work like it did on a previous operating system. I'm happy to help assist you in finding the best resolution.
macOS should read these files and you should be able to open them fine with no issues, so I would suggest doing a fresh restart of your computer to see if that helps.
If you still have an issue after that, try a backup of your Mac's important data and a reinstall of macOS using the following articles:
Use Time Machine to back up or restore your Mac
How to reinstall macOS
Please let us know if this helps.
Have a great day!

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Oct 17, 2016 11:29 AM

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The macOS Sierra specifically focuses on the performance, compatibility, stability and the security of Mac with numerous enhancements. It comes packed with different new features and various enhancements to provide the best Mac operating system. A sleek user interface with the support for all the latest devices and better compatibility features. Also, it efficiently consumes the system resources and performs all the operations without slowing down your Mac computer.

This release includes various fixes for audio stuttering when using USB headphones. Better Mac App Store compatibility with all the latest updates. Moreover, it also adds support for installing Windows 10 Creators Update. In addition, it adds support for camera RAW formats along with various Photos enhancements. Also, this release fixes a date issue for education and enterprise customers. Potential Kernel Panic prevention at the time of starting up with a NetInstall image and much more to provide a stable environment for all.

Aug 06, 2019 Experimental version of the Legends of Aria game client, used for beta testing upcoming changes. Legends of Aria is a game where players create the content, whether that content starts out as a violent vendetta against an enemy guild or an arduous trek through the perilous wilderness. Dec 12, 2019 Get a head start in Celador with the Legends of Aria Starer Pack. Certificates of Training grant your characters Master level skills. in a template of your choice, allowing you to get straight into the action. Gems can be spent in our in-game store, offering a variety of cosmetic and quality of life items. Featuring: 1 Certificates of Training; 600 Gems. Legends of Aria is a full loot sandbox MMORPG with a living, breathing world defined and shaped by its player community. It is a world of dangers, where bonds are forged - and broken. It's actually encouraging considering Legend of Aria is made in Unity and most of things that would make a Mac client difficult would be DirectX11+ specific shaders. Which Legend of Aria does not use (otherwise, it wouldn't run in Parallels either). So once the game's finally released, a Mac. Legends of aria mac os.

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Intelligent OS with various enhancements
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New Safari extensions and much more

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Technical Details of macOS Sierra 10.12.5

Macos 10.12 Sierra Dmg

File Name: macOS_Sierra_12.5.dmg
File Size: 4.6 GB
Developer: Apple

System Requirements for macOS Sierra 10.12.5

8 GB free HDD
2GB RAM
Core 2 Duo Intel Processor

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