A crew member (enigma 9o7) on the Bodhi Linux forum helped me with the installation:
Here are instructions for installing koreader using terminal. Remember to paste each line one at a time:
sudo apt install wget unzip
cd /tmp
wget
https://storage.gra.cloud.ovh.net/v1...r-v2024.01.zip
wget
https://storage.gra.cloud.ovh.net/v1...ix_install.zip
unzip kfm_nix_install.zip
chmod +x install.sh
./install.sh