The Blizzard Update Agent could not install in the specified folder location.
Troubleshooting steps for this error in Diablo III
You have attempted to connect to an invalid server. If this problem persists, please contact Customer Support.
What to do if you internet service provider (ISP) is encountering connection issues.
We're having trouble starting the Battle.net desktop app. Please try again. If the problem persists, try restarting your computer.
Troubleshooting the error message "The code you entered cannot be claimed."