I have downloaded the tarball, then typed
sudo apt-get install python-pip3
then sudo pip3 install PyQt5
cd Downloads
cd ATC-pie
python3 ATC-pie.py
XDG-runtime_DIR not sent, setting to default
Reading word navigation data... done
and in the configuration I typed in KBOS as airport and it says this when I press start
'ascii' codec can't encode character '\xb0' in position 21: ordinal not in range(128)
I am on Chrubuntu so that may be the problem
Contact me at flightgearfreakyt@gmail.com