is there any problem with installing kaspersky antivirus on Macbook air 2019??

Hello!

Mac computers do not need any sort of anti-virus software. Anti-virus can cause performance issues, security issues, and make macOS appear buggy. Your Mac is worse with these types of Apps installed.

In addition, Mac computers cannot get any traditional "viruses". They only area of concern is some malware, mostly adware, and it's easily avoidable. Do not install apps from unknown sources, and you'll be safe!

Here are some links that describe Apple's built-in malware protection, which are far superior:

•  macOS - Security - Apple
• Protecting against malware in macOS - Apple Support

Jack