Run

Windows

Install Java from Oracle Java website clicking on Free Java Download. Make sure you download at least Version 8.

Run pattypan by double-click pattypan.jar.

Ubuntu

Install Java

sudo apt-get install openjdk-8-jdk
sudo apt-get install openjfx

Run pattypan by typing in Terminal: java -jar pattypan.jar or double-click selecting option allowing run as a program before: