Because Kaspersky no longer officially hosts 2021 versions on their main site (they redirect to the 21.13+ installer), you must obtain the 21.3.10.391 build from trusted archives or offline installers.
I can create a full guide on Kaspersky Total Security 2021 (version 21.3.10.391) for Windows — installation, setup, configuration, feature walk-through, performance/tuning, troubleshooting, and removal. I'll assume you want a comprehensive, step-by-step manual including screenshots locations (text descriptions), recommended settings for privacy/security, common issues and fixes, and safe uninstall. Proceeding with that assumption. Kaspersky Total Security 2021 21.3.10.391 for W...
A: Possibly, if you have an unused activation code manufactured before 2022. However, Kaspersky's activation servers usually force-upgrade you to the latest version automatically during activation. Because Kaspersky no longer officially hosts 2021 versions
The 2021 interface was designed for clarity. The main dashboard provided a clear, color-coded status (Green for secure, Red/Yellow for issues). The settings menu, while comprehensive, was restructured to make advanced features like application control and network attack blocker more accessible to average users. Proceeding with that assumption
This version was marketed as a comprehensive "digital lifestyle" protection suite. Key capabilities included:
The core of the 21.3.10.391 update is its refined scanning engine. It doesn't just look for known viruses; it uses behavioral analysis to spot suspicious activity. If a program starts encrypting files unexpectedly—a classic sign of ransomware—Kaspersky intercepts the process and rolls back any changes made to your data. This version also features an improved "Gaming Mode," ensuring that scheduled scans and notifications are paused while you are in full-screen mode, preventing lag during gameplay. Privacy Features and Identity Protection