Run on the Proxmox host as root (next free CT/VM ID ≥100; optional interactive USB). Pin an ID, e.g. CTID=101 in the same environment before bash -c.
bash -c "$(curl -fsSL https://raw.githubusercontent.com/SchmidtPhilipp/05_prusa/main/prusalink_proxmox_lxc_install.sh)"