Download the “LINUX > Generic file ZIP”. After that, open a Terminal.
Install Java:
sudo swupd bundle-add java-basic
Change directory to “Downloads” in your home directory (should be the default where Firefox stores your downloads):
cd ~/Downloads
Extract the downloaded archive:
unzip ancestris_10-20200208.zip
Change directory to the binary directory of the extracted files:
cd ancestris/bin
Run Ancestris:
./ancestris