The nand-sata-install script is indeed quite old and not very actively maintained anymore.
A common modern replacement on Odroid XU4 (and similar boards) is to use the Armbian installer built into armbian-config. You can run:
Bash
sudo armbian-config
Then go to System → Install (or Install to SATA/USB/NVMe depending on your setup). Many people find it more reliable than the old nand-sata-install.
Alternatively, you can do it manually with dd for U-Boot + rsync for the rootfs, but armbian-config is usually the easiest route these days.
If you run into any issues with it, feel free to share the output and I can help walk you through it.