Lots of people use Discord for talking and entertainment. However, several customers have reported encountering the Discord Application Update Failure bug, which can cause Discord to not install. The most frequent issue with Discord is that it gets locked in an in an upgrade loop and hence cannot go on.
Recommended Method
Start following this tutorial to fix Discord Update Failed Error on Windows 10
Optional - Disable Windows Defender
Quick workaround for the Discord Update Failed to make a mistake might actually run the program with administrative permissions. This helps the updater to make updates to your system, so download and install the latest Discord Update.
Please notice that your local account must be an administrator for this purpose. Otherwise, you would need to have keys to the User Keys.