The zip filename was a bit of a red-herring since we don't have an installer for the Linux builds.

Extract the contents of ThemeData.zip to ~/.local/BomShankaMachines/illegalMachine

Copy the .clap or .vst3 bundle into the correct place for your system and enjoy the plugin.

When you first open the plugin it will prompt to download the factory content, or alternatively you can download the factory content zip from here : https://downloads.bomshankamachin.es/public/illegalMachine_Factory_Content.zip

After downloading extract to ~/.local/BomShankaMachines/illegalMachine