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Please purchase the game on https://olofson.itch.io/kobo-redux
and download the Linux build.

Once you have downloaded the file, please use the following command
and re-run the installation:

nix-prefetch-url file://$PWD/koboredux-0.7.5.1-Linux.tar.bz2

Alternatively, install the "koboredux-free" package, which replaces the
proprietary assets with a placeholder theme.

***