It is packaged as an appimage

So the instructions are:

• Download
• Move it to a directory you wish to run it from (e.g., ~/opt )
• Do a chmod u+x [downloaded file]
• Run it! (e.g., from a file manager, or add a launcher to your desktop)

It will create some directories in ~/.config and maybe elsewhere, so don't forget that if you later want to "uninstall".