Unexpected error occurred while updating diablo 3
installers start running today (even though you can install the game, you can't play until midnight PST), a host of issues have cropped up.Most of these can be solved by commonsense troubleshooting techniques, but some others are a bit more .We'll keep this post updated throughout the next couple of days with the latest problems and info on how to fix them.We'll also include non-Blizzard sources when appropriate (but in general, Blizzard is pretty on top of all these).We've recently become aware that playing Diablo III with the latest Catalyst 12.4 drivers for ATI cards may cause some visual artifacts for specific hardware configurations.
At this time, Compatibility Mode for the retail tools is no longer needed.
In fact, setting the tools to run in Compatibility Mode may cause other issues with the Blizzard Launcher.
If you are having issues with the game and normal troubleshooting steps have not helped, please create a thread here or you can create a Support Ticket on your Account Management page.
If it's asking for a disk then it means an entire data tome is missing from the download.
I'd recommend restarting the downloader to see if you can pick that up.
When restarting the downloader, make sure to select the same download folder that you did before.