Diablo 3 an unexpected error occurred while updating required files
In almost all cases it has to do with an overlay that the 3rd party programs use that causes the crash.If you participated in the Diablo III beta, we recommend removing all Installation Files before attempting to install the retail client.
These can be incomplete if the downloader wasn't able to finish.Point the download save at the same directory as before The folder in question is your main game data folder.If you have the game downloaded to D:\Games\Diablo-III-8370-en GB-Installer, please point the download to D:\Games\.Error 37 simply means: "The service is undergoing maintenance, please try again later." Error 12 is caused by "the Global Play feature being disabled until all regions are active".Blizzard advised players who receive this message to make sure they choose the correct region when starting the game.Similar to "An unexpected decryption error occurred", the error 108 can be caused by corrupted, damaged or incomplete installation files.
This can often times be caused by closing the downloader early.
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 .
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.
We'll keep this post updated throughout the next couple of days with the latest problems and info on how to fix them.