Announcement: New Knowledge Base

4 June 2020: We are pleased to announce the launch of a new Knowledge Base, Changelogs for Business Security Products, where you can find more details, such as bugfixes or new features, about the most recent releases of our business-related products.

Cumulative update for Windows 10 (KB3093266) prevents PSB client intallation

MikaKMikaK Posts: 22 F-Secure Product Expert

This applies to PSB Workstation Security 10.60.


Microsoft have published a cumulative update for Windows 10 (KB3093266). This update introduced a wide-ranging block on an installation component that F-Secure uses. The unfortunate side-effect of this is that the installation of F-Secure PSB Workstation Security 10.60 on Windows 10 systems will fail.


F-Secure is working actively with Microsoft to resolve the issue. For the time being, you can work around the issue in the following way:


  1. Uninstall Microsoft's cumulative update KB3093266.
  2. Reinstall PSB Workstation Security 10.60.
  3. Reinstall Microsoft's cumulative update KB3093266.

Note that, in Windows 10, Microsoft Defender is enabled by default. It will provide you with basic protection against any malware until the issue gets resolved.


For more information about the cumulative update for Windows 10, see Microsoft KB article (September 30, 2015).



  • BenBen Posts: 2,640

    A new version of PSB Workstation Security 10.60 version 2 is now available on PSB portals (PSB1,2,3 and 4). This version fixes a client installation problem on Windows 10 with Microsoft cumulative update (KB3093266) .

    You can download the new version from PSB portal under the Downloads section.

This discussion has been closed.