Patch C for Kaspersky Internet Security version 188.8.131.521 was released on June 3, 2021.
Confirmed at https://support.kaspersky.com/15595#184.108.40.2061c
Today is 10 June and I didn’t get it through KIS update!!! Update is working fine but there is no indication a new patch had been fetched from K-lab servers.
Did you get Patch (C)? Is it rolling slowly?
Thanks for sharing and responding.