If you have upgraded to Windows 10 version 1803 (RS4) or later, Kaspersky Security Cloud 19 will work with the following limitations at the first startup:

• Only the File Anti-Virus component works correctly. Other components are disabled.
• Self-Defense of files and system registry works correctly. Self-Defense of processes is disabled.
• The application interface is unavailable. 
• The application shows the following notifications:
  • Some application components are disabled.
  • Computer restart is required once the application adapts to the new operating system.
• In the context menu in the taskbar, only Exit is available.

If Device Guard is enabled in Windows 10, Kaspersky Security Cloud 19 will have the following limitations: 

• Windows 10 versions 1607 (RS1), 1703 (RS2), 1709 (RS3):
  • Protection against screen lockers
  • Protection against file-encrypting malware
• Windows 10 versions 1803 (RS4), 1809 (RS5), 1903 (19H1):
  • Clipboard protection
  • Browser protection against keyboard and mouse emulation software
  • Protection against remote management applications
  • Browser protection: management through API, protection against attacks through browser windows, protection against message queue management.
  • Detection of screen locking malware if the UMCI mode is enabled.

In Windows 10 versions 1703 (RS2), 1709 (RS3), 1803 (RS4) without 17.09.2018 or later update installed (for details, see the article at the Microsoft support site), the following issues are possible when the Device Guard mode is enabled:

• Installation of Kaspersky Security Cloud may be blocked. We recommend that you disable Device Guard or download and install an update if it was not installed automatically.
• Operating system error (Blue Screen of Death, BSOD), if Kaspersky Security Cloud was installed after rollback of Windows 10 update (17.09.2018) and computer restart.
• Operating system error (Blue Screen of Death, BSOD), if Kaspersky Security Cloud was installed after enabling the Device Guard mode and computer restart.