An unexpected error has occurred while updating diablo 3
As has been mentioned, launching the Diablo 3 downloader and directing it to the same folder as before will allow it to download the installer files again.Please make sure to leave the downloader alone as it works.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.Though the downloader may show 100%, please allow some time for it to fully complete.You may be able to fix this by running the downloader and pointing it to the same saved location so that it may scan and download any missing files. We became aware of an issue affecting the previously available German and EU English versions of the digital install downloader for Diablo III, which would not download all the necessary files.ATI Radeon HD 4600, 4700, 4800, 5000, 60 series products are unaffected, as is Windows XP.Update: ATI has released a Catalyst 12.4a driver hotfix for the affected cards.
This issue affects users of ATI Radeon HD 2400, 2600, 2900, 3400, 36 graphics cards under Windows Vista and Windows 7.
Similar to "An unexpected decryption error occurred", the error 108 can be caused by corrupted, damaged or incomplete installation files.