Just download the appropriate tusk.0.23.0-XX.AppImage file for your architecture.
make the file executable:
$ chmod +x tusk.0.23.0-XX.AppImage
and run it
$ ./tusk.0.23.0-XX.AppImage
Thanks for the info Echoreflection.
Another Linux user here. I've let my subscription lapse for the very reason that a native client is not available. Being hobbled by the web version isn't an option for me anymore.