Make sure you set your primary network adapter DNS server to 127.0.0.1 and allow dnscrypt-proxy.exe outbound through your firewall if applicable. This way even if there IS a DNS leak, it will still be falling back on encrypted DNS that doesn't leak your real IP.
AirVPN Review-With Installation Guide(2019) | Techyuga™ Sep 20, 2019 DNS Leaking Oct 08, 2017
DNS leak test
AirVPN Review - Promising VPN App w/ Small Server Network AirVPN is a VPN to allows its users to encrypt their connection to the Internet. It uses OpenVPN tunneling protocol and 4096 bit RSA encryption to hide your IP and keep your browsing session fully private. They were founded in 2010 by a group of Italian “hacktivists”. Fast forward eight years and AirVPN … Windows 10 VPN Users at Big Risk of DNS Leak Sep 23, 2015
DNS leak test
AirVPN vs Private Internet Access 2020 - 5 Tests, 1 Winner! PIA supports five simultaneous devices, compared to AirVPN’s three and offers additional features including a kill switch, DNS leak protection and servers in over 20 locations. Both VPNs have mediocre customer support at best but PIA redeems itself with impressive connection speeds.