The best way is to re-image your microSD card with latest (currently ver 8.2) image
Download PiAware Image ver 8.2 by clicking following link:
https://piaware.flightcdn.com/piaware-sd-card-8.2.img.zip
Guides here:
(1) OFFICIAL FLIGHTAWARE GUIDE:
https://flightaware.com/adsb/piaware/build/
(2) FORUM GUIDE:
How to Install and Configure Piaware 5.0 SD card image - Quickstart Guide
NOTE: Do NOT download piaware image from link in forum guide. It is for old version 5.0. Download piaware image ver 8.2 from the link I have given above OR from the download link on Official Flightaware Guide.