Kaspersky Total Security 2021 21.3.10.391 For W... May 2026

This version was the last major release before Kaspersky shifted to a "subscription-only" model in Western markets. Here is what the 21.3.10.391 build offered at its peak:

Published: October 2023 (Updated for Legacy Software Context) Kaspersky Total Security 2021 21.3.10.391 for W...

The build used a multi-layered approach: This version was the last major release before

The installer offers a quick or custom install. During testing, the default installation proceeded smoothly without forced third-party toolbars. A mandatory system scan starts after installation, which can be postponed.
One caveat: The 2021 version occasionally prompts to upgrade to a newer edition, which some users may find intrusive. Firewall & network protection

  • Firewall & network protection
  • Privacy & identity protections
  • Data protection & encryption
  • Parental controls & device management
  • Utilities & extras

    • A two-way firewall replaced the Windows default firewall. For advanced users, version 21.3.10.391 allowed packet rules and application control, but for novices, the "Auto" mode worked flawlessly to block network intrusions.

    One of the biggest selling points of version 21.3.10.391 was its light footprint. During independent tests (AV-Comparatives, Q1 2021), this version scored an "Advanced+" rating.