You can use the bitdefender free version for personal use, on your personal laptop or desktop but the security features in bitdefender free are limited when compared to commercial/ paid version. Free version only supports malware blocking & malicious/ phishing website blocking.
Scroll down to bottom of the page to know the difference between the free & paid version in the stated website (https://www.bitdefender.com/solutions/free.html)
Regards
Flex
(Bitdefender beta tester 2019/ 2020)