Download the lastest version from Arena-Tracker. Extract the executable inside the zip file and make double click on it.
Arena Tracker uses the data Hearthstone put in its logs to track the state of the game. That's why during the first run it will ask you for the path of these. If you installed Hearthstone in its default location you can skip steps 1 and 2.
there's no default location because that depends on the path of Wine or PlayOnLinux. Arena Tracker will try to find Hearthstone dirs using the find command.
The first time you run Arena Tracker you will be asked for: