There's a small bug in install.sh which manifests in a failure to install the plank files when a non-default name has been set (using -n or --name).
To fix this issue, the line
cp -r "${SRC_DIR}/other/plank/${name}${color}/"'.theme' "${THEME_DIR}/plank"
needs to be corrected to
cp -r "${SRC_DIR}/other/plank/Mojave${color}/"'.theme' "${THEME_DIR}/plank"
There's a small bug in install.sh which manifests in a failure to install the plank files when a non-default name has been set (using -n or --name). To fix this issue, the line cp -r "${SRC_DIR}/other/plank/${name}${color}/"'.theme' "${THEME_DIR}/plank" needs to be corrected to cp -r "${SRC_DIR}/other/plank/Mojave${color}/"'.theme' "${THEME_DIR}/plank"