Please prefer using the official update.sh from steam-lanchae-prefill. steam-lancache-prefill-update can be usefull for a headless instance.

steam-lancache-prefill-update

Updater for steam-lancache-prefill

1. wget https://raw.githubusercontent.com/soonic6/steam-lancache-prefill-update/main/steam_prefill_update.sh
2. nano steam_prefill_update.sh
3. edit PREFILL_PATH=/root/prefill with your steam-lancache-prefill path
4. chmod +x steam_prefill_update.sh
5. ./steam_prefill_update.sh
6. ???
7. profit