The primary selling point is that the free version uses the exact same antivirus engine as their paid, enterprise-grade products.

If you need permanent protection for a single computer rather than a managed business environment, (now part of the "Standard" plan) is the intended solution.

Technical users can sometimes join the community. By helping the developers find bugs in upcoming versions of the software, you can often use the products for free during the testing period. Understanding Kaspersky Endpoint Security Licensing

Once you have a legitimate code, you can activate the software through the Kaspersky Endpoint Security Cloud Management Console or the local Administration Console.

Useful, lawful alternatives and information you can use instead:

Endpoint security is critical for businesses of all sizes. Endpoints, such as laptops, desktops, and mobile devices, are often the weakest link in a company's security chain. Cyber attackers frequently target endpoints to gain access to sensitive data, disrupt business operations, or extort money through ransomware attacks.