IoT Enterprise LTSC 21H2 19044.5247 (64-bit) Just performing through WuMgr the Cumulative Update KB5048652. After successufully install it and reboot then OS partition size is increased of 3,5 GB. Disk Cleanup does not show to delete any Windows Update related files. As greatly suggested by @abbodi1406 here I emptied the \Windows\Servicing\LCU folder (1,08GB) and as I usually do the \Windows\SoftwareDistribution\Download folder (850MB) too, but the remaining increased OS size remained 1.6 GB more than before the WU. Code: fsutil storagereserve query C: returns just 58MB. Is there anything that can be done to reduce it further or is it normal for it to be such a big increase with KB5048652 update? Thanks a lot in advance!