When using Kaspersky Security Center as a WSUS server, the following folders will gradually increase in size: C:\ProgramData\KasperskyLab\adminkit\1093\.working\FTServer; C:\ProgramData\KasperskyLab\adminkit\1093\.working\wusfiles.
You can empty not used Updates in the FTServer and wusfiles folders containing Microsoft updates in Kaspersky Security Center 11:
KSC 12 - How can I Clear a Bloated FTSERVER Directory?
in Kaspersky Endpoint Security for Business
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When using Kaspersky Security Center as a WSUS server, the following folders will gradually increase in size:
C:\ProgramData\KasperskyLab\adminkit\1093\.working\FTServer;
C:\ProgramData\KasperskyLab\adminkit\1093\.working\wusfiles.
You can empty not used Updates in the FTServer and wusfiles folders containing Microsoft updates in Kaspersky Security Center 11:
https://support.kaspersky.com/15304