Download the deb-file. Install app by the terminal command:

sudo dpkg -i ./coil64-2.4.39-amd64.deb

To remove app from your machine type in the terminal:

sudo dpkg --purge coil64-2.4.39-amd64

Also one can use Gdebi or Synaptic to install or remove the application. The app settings are stored in the file "~/.config/Coil64/Coil64.conf". You can keep it for the future installations or remove manually to completely clean the app from your system.

Also you can use the portable Linux version of the app: Coil64-linux-portable.