Files under: C:\Windows\SoftwareDistribution\

https://social.technet.microsoft.com/Forums/ie/en-US/d1816c14-f953-4068-b3f0-e49558fe0845/datastoreedb-file?forum=winserverfiles

For a complete cleaning (clearing also the whole update history):
1.net stop wuauserv
2.delete all files inside the C:\Windows\SoftwareDistribution\Download directory
3.delete the DataStore.edb into C:\Windows\SoftwareDistribution\DataStore
4.net start wuauserv

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