How to install Kaspersky Internet Security on macOS 10.12 and 10.13

Kaspersky Internet Security 21 for Mac runs on MacOS version 10.14 and later. If you want to install Kaspersky Internet Security for Mac on macOS versions 10.12 and 10.13, use the previous version of the application. The earlier versions of macOS are not supported.
To install the previous version of the application:

1. Install Kaspersky Internet Security 20 for Mac. See this article for instructions.
2. Connect the application to My Kaspersky, see this guide.

Useful references

System requirements for Kaspersky Internet Security 20 for Mac
System requirements for Kaspersky Internet Security 21 for Mac