Usually this error indicates that you have tried to set a value which is bigger than half of your current available disk space in MetaDefender Core temporary directory.
For example, if you have 20 GB of disk space available and you set the maximum total size of extracted files at 11 GB, you will get an "Update failed" message.
The maximum allowed amount for this setting is 10 GB.
This article applies to MetaDefender Core v3
This article was last updated on 2017-12-21