Kaspersky Total Security V21.3.10.391 3 Month... [top]

It sounds like you're looking to write a blog post about a specific version of Kaspersky Total Security (v21.3.10.391) and a 3-month trial or license key.

However, I need to give you a critical heads-up before you publish: Version 21.3.10.391 is outdated and poses security risks.

  • Current Version: Kaspersky is now on version 21.19 or higher (as of 2025/2026).
  • The Risk: Using an old version exposes users to known vulnerabilities that have been patched in newer releases. It may also lack compatibility with Windows 11 updates and new malware signatures.

If you still want to write about this (e.g., for historical analysis, or to warn people), here is a balanced, honest blog post template you can use.

Security Tips for Your 3-Month Period

To get the most out of Kaspersky Total Security v21.3.10.391 during the 90 days: Kaspersky Total Security v21.3.10.391 3 month...

  1. Run a "Full Scan" immediately after activation – older builds may have slower default scan schedules.
  2. Configure the Firewall to "Public Network" when traveling; "Local Network" at home.
  3. Enable "System Watcher" (this is the behavioral ransomware rollback feature – crucial for the 3-month trial).
  4. Set a calendar reminder for day 85 to decide whether to renew, uninstall, or find another code.

What is Kaspersky Total Security v21.3.10.391?

Kaspersky Total Security is the flagship, all-in-one security suite from Kaspersky Lab. Version number 21.3.10.391 refers to a specific build released in late 2020 to early 2021. While Kaspersky has since released newer versions (like 21.4, 21.5, and the ‘Plus’ series), build 21.3.10.391 remains a highly stable, lightweight, and feature-complete iteration.

The “3-month” designation typically applies to a trial license key that provides full premium access to the software for 90 days. Unlike many free antivirus solutions, this 3-month license unlocks every feature without watermarks, pop-ups asking for an upgrade, or disabled modules.

Final Verdict

Avoid. A 3-month trial of an outdated antivirus is not worth the security debt. Download the latest Kaspersky Free or Standard trial directly from www.kaspersky.com instead. It sounds like you're looking to write a

Key Features in v21.3.10.391

This version packs a punch with features usually reserved for high-end paid subscriptions:

  • Multi-Layered Antivirus Protection: At its core, the engine provides real-time defense against viruses, ransomware, and spyware. The v21.3.10.391 build is optimized for low system impact, ensuring your PC runs smoothly even during heavy scans.
  • Safe Money Technology: One of Kaspersky’s standout features. It adds an extra layer of security when you bank or shop online, launching a secure browser window to prevent keyloggers and screen-scrapers from stealing your financial data.
  • Privacy Protection: It includes a VPN (with a daily data limit in the trial) to keep your browsing anonymous, as well as webcam protection to stop hackers from spying on you.
  • Password Manager: The suite includes a secure password vault, helping you generate and store complex passwords so you never have to remember them all.
  • Parental Controls: For families, this feature is invaluable. It allows you to block inappropriate content, manage screen time, and monitor your children's social media activity.

Final Verdict

Kaspersky Total Security v21.3.10.391 remains a gold standard in the cybersecurity industry. If you have been on the fence about upgrading from a free antivirus or switching brands, this 3-month window provides ample time to decide if Kaspersky’s legendary detection rates and rich feature set are right for you.

Resource Usage

On an average Windows 10 system with 8 GB RAM: Current Version: Kaspersky is now on version 21

  • Idle: 45–60 MB RAM
  • Active scan: 250–300 MB RAM, 15–20% CPU (single core)
  • Gaming mode: Automatically suppresses scans and updates. No FPS drop in titles like Cyberpunk 2077 or Call of Duty.

Is the 3-Month Offer for v21.3.10.391 Right for You?

This specific deal is ideal for:

  • Students who need temporary protection for a semester.
  • IT testers who want to verify KTS works on legacy systems (POS terminals, industrial PCs).
  • Second-hand PC buyers who just got a Windows 10 machine and want 90 days of security while they set up other tools.
  • Privacy-conscious users who dislike cloud-dependent newer versions (v21.3 allows fully offline activation).

However, avoid this version if you:

  • Use Windows 11 (go for v21.7 or newer).
  • Rely on unlimited VPN (KTS VPN is capped).
  • Need 24/7 chat support (Kaspersky often asks you to update to the latest version before assisting).