Blizzard updating tools
This replaces the launcher for all Blizzard games, and works similar to the older launchers, with background updates, repair tool, and more.On January 9, 2018, the Mac OS X version of the "Battle.net" app requested a restart and then failed to launch, instead going to the Blizzard Error app.
For the time being, the desktop app generates a self-signed certificate that’s unique to your machine and configures your system to trust it.
Patch 1.7 was released in mid February 2017 and added a Suggested Friends feature that added several ways to look for potential new friends (friends of friends, Facebook friends, and Diablo friends).
Patch 1.6 was released in late November, but apparently was wrongly versioned and patch 1.5.2 returned the next day. Patch 1.5.1 added Blizzard Voice Chat with Patch 1.5.2 adding improvements and bug fixes.
It appears to be a unified version of Blizzard Launcher for all of their games.
It has a UI that resembles the more minimalist design of the web site as compared with the more textured UI of the game-specific launcher.